one-time carousel of changes

// FREEBIE

Signal.xcodeproj/project.pbxproj

@@ -13,6 +13,12 @@
 		34535D821E256BE9008A4747 /* UIView+OWS.m in Sources */ = {isa = PBXBuildFile; fileRef = 34535D811E256BE9008A4747 /* UIView+OWS.m */; };
 		348F3A4F1E4A533900750D44 /* CallInterstitialViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 348F3A4E1E4A533900750D44 /* CallInterstitialViewController.swift */; };
 		34FD93701E3BD43A00109093 /* OWSAnyTouchGestureRecognizer.m in Sources */ = {isa = PBXBuildFile; fileRef = 34FD936F1E3BD43A00109093 /* OWSAnyTouchGestureRecognizer.m */; };
+		4505C2BF1E648EA300CEBF41 /* ExperienceUpgrade.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4505C2BE1E648EA300CEBF41 /* ExperienceUpgrade.swift */; };
+		4505C2C01E648EA300CEBF41 /* ExperienceUpgrade.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4505C2BE1E648EA300CEBF41 /* ExperienceUpgrade.swift */; };
+		4505C2C21E648F7A00CEBF41 /* ExperienceUpgradeFinder.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4505C2C11E648F7A00CEBF41 /* ExperienceUpgradeFinder.swift */; };
+		4505C2C31E648F7A00CEBF41 /* ExperienceUpgradeFinder.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4505C2C11E648F7A00CEBF41 /* ExperienceUpgradeFinder.swift */; };
+		4505C2C51E64977D00CEBF41 /* ExperienceUpgradeViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4505C2C41E64977D00CEBF41 /* ExperienceUpgradeViewController.swift */; };
+		4505C2C61E64977D00CEBF41 /* ExperienceUpgradeViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4505C2C41E64977D00CEBF41 /* ExperienceUpgradeViewController.swift */; };
 		450873C31D9D5149006B54F2 /* OWSExpirationTimerView.m in Sources */ = {isa = PBXBuildFile; fileRef = 450873C21D9D5149006B54F2 /* OWSExpirationTimerView.m */; };
 		450873C41D9D5149006B54F2 /* OWSExpirationTimerView.m in Sources */ = {isa = PBXBuildFile; fileRef = 450873C21D9D5149006B54F2 /* OWSExpirationTimerView.m */; };
 		450873C71D9D867B006B54F2 /* OWSIncomingMessageCollectionViewCell.m in Sources */ = {isa = PBXBuildFile; fileRef = 450873C61D9D867B006B54F2 /* OWSIncomingMessageCollectionViewCell.m */; };
@@ -82,6 +88,8 @@
 		45AE48511E0732D6004D96C2 /* TurnServerInfo.swift in Sources */ = {isa = PBXBuildFile; fileRef = 45AE48501E0732D6004D96C2 /* TurnServerInfo.swift */; };
 		45AE48521E0732D6004D96C2 /* TurnServerInfo.swift in Sources */ = {isa = PBXBuildFile; fileRef = 45AE48501E0732D6004D96C2 /* TurnServerInfo.swift */; };
 		45B201761DAECBFE00C461E0 /* HighlightableLabel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 45B201751DAECBFE00C461E0 /* HighlightableLabel.swift */; };
+		45BB93381E688E14001E3939 /* UIDevice+featureSupport.swift in Sources */ = {isa = PBXBuildFile; fileRef = 45BB93371E688E14001E3939 /* UIDevice+featureSupport.swift */; };
+		45BB93391E688E14001E3939 /* UIDevice+featureSupport.swift in Sources */ = {isa = PBXBuildFile; fileRef = 45BB93371E688E14001E3939 /* UIDevice+featureSupport.swift */; };
 		45BD60821DE9547E00A8F436 /* Contacts.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 45BD60811DE9547E00A8F436 /* Contacts.framework */; settings = {ATTRIBUTES = (Weak, ); }; };
 		45BFFFA81D898AF0004A12A7 /* OWSStaleNotificationObserver.m in Sources */ = {isa = PBXBuildFile; fileRef = 45BFFFA71D898AF0004A12A7 /* OWSStaleNotificationObserver.m */; };
 		45BFFFA91D898AF0004A12A7 /* OWSStaleNotificationObserver.m in Sources */ = {isa = PBXBuildFile; fileRef = 45BFFFA71D898AF0004A12A7 /* OWSStaleNotificationObserver.m */; };
@@ -612,6 +620,9 @@
 		348F3A4E1E4A533900750D44 /* CallInterstitialViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CallInterstitialViewController.swift; sourceTree = "<group>"; };
 		34FD936E1E3BD43A00109093 /* OWSAnyTouchGestureRecognizer.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = OWSAnyTouchGestureRecognizer.h; path = views/OWSAnyTouchGestureRecognizer.h; sourceTree = "<group>"; };
 		34FD936F1E3BD43A00109093 /* OWSAnyTouchGestureRecognizer.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = OWSAnyTouchGestureRecognizer.m; path = views/OWSAnyTouchGestureRecognizer.m; sourceTree = "<group>"; };
+		4505C2BE1E648EA300CEBF41 /* ExperienceUpgrade.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = ExperienceUpgrade.swift; path = ExperienceUpgrades/ExperienceUpgrade.swift; sourceTree = "<group>"; };
+		4505C2C11E648F7A00CEBF41 /* ExperienceUpgradeFinder.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ExperienceUpgradeFinder.swift; sourceTree = "<group>"; };
+		4505C2C41E64977D00CEBF41 /* ExperienceUpgradeViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ExperienceUpgradeViewController.swift; sourceTree = "<group>"; };
 		450873C11D9D5149006B54F2 /* OWSExpirationTimerView.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = OWSExpirationTimerView.h; sourceTree = "<group>"; };
 		450873C21D9D5149006B54F2 /* OWSExpirationTimerView.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = OWSExpirationTimerView.m; sourceTree = "<group>"; };
 		450873C51D9D867B006B54F2 /* OWSIncomingMessageCollectionViewCell.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = OWSIncomingMessageCollectionViewCell.h; sourceTree = "<group>"; };
@@ -691,6 +702,7 @@
 		45AE48501E0732D6004D96C2 /* TurnServerInfo.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TurnServerInfo.swift; sourceTree = "<group>"; };
 		45B201741DAECBFD00C461E0 /* Signal-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "Signal-Bridging-Header.h"; sourceTree = "<group>"; };
 		45B201751DAECBFE00C461E0 /* HighlightableLabel.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = HighlightableLabel.swift; sourceTree = "<group>"; };
+		45BB93371E688E14001E3939 /* UIDevice+featureSupport.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "UIDevice+featureSupport.swift"; sourceTree = "<group>"; };
 		45BD60811DE9547E00A8F436 /* Contacts.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Contacts.framework; path = System/Library/Frameworks/Contacts.framework; sourceTree = SDKROOT; };
 		45BFFFA61D898AF0004A12A7 /* OWSStaleNotificationObserver.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = OWSStaleNotificationObserver.h; path = Observers/OWSStaleNotificationObserver.h; sourceTree = "<group>"; };
 		45BFFFA71D898AF0004A12A7 /* OWSStaleNotificationObserver.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = OWSStaleNotificationObserver.m; path = Observers/OWSStaleNotificationObserver.m; sourceTree = "<group>"; };
@@ -719,7 +731,7 @@
 		45EB32CD1D7465C900735B2E /* OWSLinkedDevicesTableViewController.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = OWSLinkedDevicesTableViewController.h; sourceTree = "<group>"; };
 		45EB32CE1D7465C900735B2E /* OWSLinkedDevicesTableViewController.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = OWSLinkedDevicesTableViewController.m; sourceTree = "<group>"; };
 		45F170AB1E2F0351003FC1F2 /* CallAudioSession.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CallAudioSession.swift; sourceTree = "<group>"; };
-		45F170AE1E2F0393003FC1F2 /* CallAudioSessionTest.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = CallAudioSessionTest.swift; path = test/call/CallAudioSessionTest.swift; sourceTree = "<group>"; };
+		45F170AE1E2F0393003FC1F2 /* CallAudioSessionTest.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CallAudioSessionTest.swift; sourceTree = "<group>"; };
 		45F170B31E2F0A6A003FC1F2 /* RTCAudioSession.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RTCAudioSession.h; sourceTree = "<group>"; };
 		45F170BA1E2FC5D3003FC1F2 /* CallAudioService.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CallAudioService.swift; sourceTree = "<group>"; };
 		45F170CB1E310E22003FC1F2 /* WeakTimer.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = WeakTimer.swift; sourceTree = "<group>"; };
@@ -1311,6 +1323,15 @@
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		4505C2BD1E648E6E00CEBF41 /* ExperienceUpgrades */ = {
+			isa = PBXGroup;
+			children = (
+				4505C2BE1E648EA300CEBF41 /* ExperienceUpgrade.swift */,
+				4505C2C11E648F7A00CEBF41 /* ExperienceUpgradeFinder.swift */,
+			);
+			name = ExperienceUpgrades;
+			sourceTree = "<group>";
+		};
 		450DF2061E0DD28D003D14BE /* UserInterface */ = {
 			isa = PBXGroup;
 			children = (
@@ -1589,6 +1610,7 @@
 		76EB041118170B33006006FC /* environment */ = {
 			isa = PBXGroup;
 			children = (
+				4505C2BD1E648E6E00CEBF41 /* ExperienceUpgrades */,
 				45666F731D9BFDB9008FE134 /* Migrations */,
 				B6258B311C29E2E60014138E /* NotificationsManager.h */,
 				B6258B321C29E2E60014138E /* NotificationsManager.m */,
@@ -2033,6 +2055,7 @@
 				FC3196311A08141D0094C78E /* Settings */,
 				FC3196321A08142D0094C78E /* Signals */,
 				FCFD25791A1543D500F4C644 /* Signup */,
+				4505C2C41E64977D00CEBF41 /* ExperienceUpgradeViewController.swift */,
 			);
 			name = "View Controllers";
 			path = "view controllers";
@@ -2212,6 +2235,7 @@
 		B660F6731C29867F00687D6E /* call */ = {
 			isa = PBXGroup;
 			children = (
+				45F170AE1E2F0393003FC1F2 /* CallAudioSessionTest.swift */,
 				456F6E2E1E261D1000FD2210 /* PeerConnectionClientTest.swift */,
 				B660F6741C29867F00687D6E /* RecentCallTest.m */,
 			);
@@ -2492,7 +2516,6 @@
 				B660F66C1C29867F00687D6E /* test */,
 				D221A094169C9E5E00537ABF /* Supporting Files */,
 				B66DBF4919D5BBC8006EA940 /* Images.xcassets */,
-				45F170AE1E2F0393003FC1F2 /* CallAudioSessionTest.swift */,
 			);
 			path = Signal;
 			sourceTree = "<group>";
@@ -2656,6 +2679,7 @@
 				EF764C341DB67CC5000D9A87 /* UIViewController+CameraPermissions.m */,
 				344F2F651E57A932000D9322 /* UIViewController+OWS.h */,
 				344F2F661E57A932000D9322 /* UIViewController+OWS.m */,
+				45BB93371E688E14001E3939 /* UIDevice+featureSupport.swift */,
 			);
 			name = "UI Categories";
 			path = ..;
@@ -3071,6 +3095,7 @@
 				76EB061218170B33006006FC /* LoggingUtil.m in Sources */,
 				76EB060E18170B33006006FC /* DecayingSampleEstimator.m in Sources */,
 				340757C21E5602D6001F15DD /* AttachmentSharing.m in Sources */,
+				4505C2C21E648F7A00CEBF41 /* ExperienceUpgradeFinder.swift in Sources */,
 				76EB05BA18170B33006006FC /* CommitPacket.m in Sources */,
 				344F2F671E57A932000D9322 /* UIViewController+OWS.m in Sources */,
 				76EB060218170B33006006FC /* InitiatorSessionDescriptor.m in Sources */,
@@ -3093,6 +3118,7 @@
 				4531C9C41DD8E6D800F08304 /* JSQMessagesCollectionViewCell+OWS.m in Sources */,
 				4516E3FF1DD2193B00DC4206 /* OWS101ExistingUsersBlockOnIdentityChange.m in Sources */,
 				76EB05A818170B33006006FC /* RtpSocket.m in Sources */,
+				4505C2BF1E648EA300CEBF41 /* ExperienceUpgrade.swift in Sources */,
 				45387B041E36D650005D00B3 /* OWS102MoveLoggingPreferenceToUserDefaults.m in Sources */,
 				E197B61818BBEC1A00F073E5 /* RemoteIOAudio.m in Sources */,
 				B67ADDC41989FF8700E1A773 /* RPServerRequestsManager.m in Sources */,
@@ -3184,6 +3210,7 @@
 				E197B61118BBEC1A00F073E5 /* AudioProcessor.m in Sources */,
 				FCAC964019FEF99A0046DFC5 /* InboxTableViewCell.m in Sources */,
 				76EB05EA18170B33006006FC /* CallProgress.m in Sources */,
+				4505C2C51E64977D00CEBF41 /* ExperienceUpgradeViewController.swift in Sources */,
 				458E38371D668EBF0094BD24 /* OWSDeviceProvisioningURLParser.m in Sources */,
 				FCFA64B41A24F3880007FB87 /* UIColor+OWS.m in Sources */,
 				4517642B1DE939FD00EDB8B9 /* ContactCell.swift in Sources */,
@@ -3242,6 +3269,7 @@
 				45EB32CF1D7465C900735B2E /* OWSLinkedDevicesTableViewController.m in Sources */,
 				45F659731E1BD99C00444429 /* CallKitCallUIAdaptee.swift in Sources */,
 				B63761EE19E1FBE8005735D1 /* HttpRequestUtil.m in Sources */,
+				45BB93381E688E14001E3939 /* UIDevice+featureSupport.swift in Sources */,
 				458DE9D61DEE3FD00071BB03 /* PeerConnectionClient.swift in Sources */,
 				451DE9FD1DC1A28200810E42 /* SyncPushTokensJob.swift in Sources */,
 				76EB05B618170B33006006FC /* MasterSecret.m in Sources */,
@@ -3305,6 +3333,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				4505C2C31E648F7A00CEBF41 /* ExperienceUpgradeFinder.swift in Sources */,
 				B660F7001C29988E00687D6E /* AppAudioManager.m in Sources */,
 				B660F7011C29988E00687D6E /* AudioRouter.m in Sources */,
 				B660F7021C29988E00687D6E /* AudioPacker.m in Sources */,
@@ -3346,6 +3375,7 @@
 				B660F71D1C29988E00687D6E /* LocalizableText.m in Sources */,
 				B660F71F1C29988E00687D6E /* PropertyListPreferences.m in Sources */,
 				B660F7201C29988E00687D6E /* Release.m in Sources */,
+				45BB93391E688E14001E3939 /* UIDevice+featureSupport.swift in Sources */,
 				B660F7211C29988E00687D6E /* SignalKeyingStorage.m in Sources */,
 				B660F7221C29988E00687D6E /* VersionMigrations.m in Sources */,
 				B660F7231C29988E00687D6E /* DnsManager.m in Sources */,
@@ -3522,11 +3552,13 @@
 				B660F6CD1C29868000687D6E /* UdpSocketTest.m in Sources */,
 				B660F6DD1C29868000687D6E /* ObservableTest.m in Sources */,
 				B660F6D21C29868000687D6E /* PushManagerTest.m in Sources */,
+				4505C2C01E648EA300CEBF41 /* ExperienceUpgrade.swift in Sources */,
 				B660F6C61C29868000687D6E /* MasterSecretTest.m in Sources */,
 				B660F6D91C29868000687D6E /* CyclicalBufferTest.m in Sources */,
 				B660F6DC1C29868000687D6E /* FutureUtilTest.m in Sources */,
 				450873C81D9D867B006B54F2 /* OWSIncomingMessageCollectionViewCell.m in Sources */,
 				B660F6CA1C29868000687D6E /* LowLatencyConnectorTest.m in Sources */,
+				4505C2C61E64977D00CEBF41 /* ExperienceUpgradeViewController.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

Signal/Images.xcassets/introductory_splash_callkit.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "signal-answer.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "signal-answer@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "signal-answer@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Signal/Images.xcassets/introductory_splash_video_calling.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "signal-video-splash.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "signal-video-splash@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "signal-video-splash@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Signal/src/UIDevice+featureSupport.swift

@@ -0,0 +1,11 @@
+//
+//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//
+
+import Foundation
+
+extension UIDevice {
+    var supportsCallKit: Bool {
+        return ProcessInfo().isOperatingSystemAtLeast(OperatingSystemVersion(majorVersion: 10, minorVersion: 0, patchVersion: 0))
+    }
+}

Signal/src/UIView+OWS.h

@@ -49,4 +49,7 @@ CGFloat ScaleFromIPhone5(CGFloat iPhone5Value);
 - (void)addBorderWithColor:(UIColor *)color;
 - (void)addRedBorder;
 
+// Add red border to self, and all subviews recursively.
+- (void)addRedBorderRecursively;
+
 @end

Signal/src/UIView+OWS.m

@@ -166,4 +166,12 @@ CGFloat ScaleFromIPhone5(CGFloat iPhone5Value)
     [self addBorderWithColor:[UIColor redColor]];
 }
 
+- (void)addRedBorderRecursively
+{
+    [self addRedBorder];
+    for (UIView *subview in self.subviews) {
+        [subview addRedBorderRecursively];
+    }
+}
+
 @end

Signal/src/environment/ExperienceUpgradeFinder.swift

@@ -0,0 +1,38 @@
+//
+//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//
+
+import Foundation
+
+class ExperienceUpgradeFinder: NSObject {
+    public let TAG = "[ExperienceUpgradeFinder]"
+
+    // Keep these ordered by increasing uniqueId.
+    private var allExperienceUpgrades: [ExperienceUpgrade] {
+        var upgrades = [ExperienceUpgrade(uniqueId: "001",
+                                          title: NSLocalizedString("UPGRADE_EXPERIENCE_VIDEO_TITLE", comment: "Header for upgrade experience"),
+                                          body: NSLocalizedString("UPGRADE_EXPERIENCE_VIDEO_DESCRIPTION", comment: "Description of video calling to upgrading (existing) users"),
+                                          image: #imageLiteral(resourceName: "introductory_splash_video_calling"))]
+
+        if UIDevice.current.supportsCallKit {
+            upgrades.append(ExperienceUpgrade(uniqueId: "002",
+                                              title: NSLocalizedString("UPGRADE_EXPERIENCE_CALLKIT_TITLE", comment: "Header for upgrade experience"),
+                                              body: NSLocalizedString("UPGRADE_EXPERIENCE_CALLKIT_DESCRIPTION", comment: "Description of CallKit to upgrading (existing) users"),
+                                              image: #imageLiteral(resourceName: "introductory_splash_callkit")))
+        }
+
+        return upgrades
+    }
+
+
+    // MARK: - Instance Methods
+
+    public func allUnseen(transaction: YapDatabaseReadTransaction) -> [ExperienceUpgrade] {
+        return allExperienceUpgrades.filter { ExperienceUpgrade.fetch(withUniqueID: $0.uniqueId, transaction: transaction) == nil }
+    }
+
+    public func markAllAsSeen(transaction: YapDatabaseReadWriteTransaction) {
+        Logger.info("\(TAG) marking experience upgrades as seen")
+        allExperienceUpgrades.forEach { $0.save(with: transaction) }
+    }
+}

Signal/src/environment/ExperienceUpgrades/ExperienceUpgrade.swift

@@ -0,0 +1,69 @@
+//
+//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//
+
+import Foundation
+
+class ExperienceUpgrade: TSYapDatabaseObject {
+    let title: String
+    let body: String
+    let image: UIImage?
+    var seenAt: Date?
+
+    required init(uniqueId: String, title: String, body: String, image: UIImage) {
+        self.title = title
+        self.body = body
+        self.image  = image
+        super.init(uniqueId: uniqueId)
+    }
+
+    override required init(uniqueId: String) {
+        // This is the unfortunate seam between strict swift and fast-and-loose objc
+        // we can't leave these properties nil, since we really "don't know" that the superclass
+        // will assign them.
+        self.title = "New Feature"
+        self.body = "Bug fixes and performance improvements."
+        self.image = nil
+        super.init(uniqueId: uniqueId)
+    }
+    
+    required init!(coder: NSCoder!) {
+        // This is the unfortunate seam between strict swift and fast-and-loose objc
+        // we can't leave these properties nil, since we really "don't know" that the superclass
+        // will assign them.
+        self.title = "New Feature"
+        self.body = "Bug fixes and performance improvements."
+        self.image = nil
+        super.init(coder: coder)
+    }
+    
+    required init(dictionary dictionaryValue: [AnyHashable : Any]!) throws {
+        // This is the unfortunate seam between strict swift and fast-and-loose objc
+        // we can't leave these properties nil, since we really "don't know" that the superclass
+        // will assign them.
+        self.title = "New Feature"
+        self.body = "Bug fixes and performance improvements."
+        self.image = nil
+        try super.init(dictionary: dictionaryValue)
+    }
+
+    override class func storageBehaviorForProperty(withKey propertyKey: String) -> MTLPropertyStorage {
+        // These exist in a hardcoded set - no need to save them, plus it allows us to
+        // update copy/image down the line if there was a typo and we want to re-expose
+        // these models in a "change log" archive.
+        if propertyKey == "title" || propertyKey == "body" || propertyKey == "image" {
+            return MTLPropertyStorageNone
+        } else if propertyKey == "uniqueId" || propertyKey == "seenAt" {
+            return super.storageBehaviorForProperty(withKey: propertyKey)
+        } else {
+            // Being conservative here in case we rename a property.
+            assertionFailure("unknown property \(propertyKey)")
+            return super.storageBehaviorForProperty(withKey: propertyKey)
+        }
+    }
+
+    func markAsSeen(transaction: YapDatabaseReadWriteTransaction) {
+        self.seenAt = Date()
+        super.save(with: transaction)
+    }
+}

Signal/src/view controllers/CallViewController.swift

@@ -910,7 +910,7 @@ class CallViewController: UIViewController, CallObserver, CallServiceObserver, R
             return
         } else if !ignoreNag &&
             call.direction == .incoming &&
-            supportsCallKit() &&
+            UIDevice.current.supportsCallKit &&
             (!Environment.getCurrent().preferences.isCallKitEnabled() ||
                 Environment.getCurrent().preferences.isCallKitPrivacyEnabled()) {
 
@@ -948,13 +948,7 @@ class CallViewController: UIViewController, CallObserver, CallServiceObserver, R
             self.dismiss(animated: false, completion:completion)
         }
     }
-
+    
-    // MARK: - Util
-
-    private func supportsCallKit() -> Bool {
-        return ProcessInfo().isOperatingSystemAtLeast(OperatingSystemVersion(majorVersion: 10, minorVersion: 0, patchVersion: 0))
-    }
-
     // MARK: - CallServiceObserver
 
     internal func didUpdateCall(call: SignalCall?) {

Signal/src/view controllers/ExperienceUpgradeViewController.swift

@@ -0,0 +1,292 @@
+//
+//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//
+
+import Foundation
+
+class ExperienceUpgradeViewController: UIViewController, UIScrollViewDelegate {
+    let TAG = "[ExperienceUpgradeViewController]"
+
+    private let experienceUpgrades: [ExperienceUpgrade]
+
+    private var nextButton: UIButton!
+    private var previousButton: UIButton!
+
+    // MARK: - Initializers
+    required init(experienceUpgrades: [ExperienceUpgrade]) {
+        self.experienceUpgrades = experienceUpgrades
+        super.init(nibName: nil, bundle: nil)
+    }
+
+    @available(*, unavailable, message:"unavailable, use initWithExperienceUpgrade instead")
+    required init?(coder aDecoder: NSCoder) {
+        assert(false)
+        // This should never happen, but so as not to explode we give some bogus data
+        self.experienceUpgrades = [ExperienceUpgrade()]
+        super.init(coder: aDecoder)
+    }
+
+    // MARK: - View lifecycle
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        addDismissGesture()
+        showCurrentSlide()
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+
+        // Avoid any possible vertical scrolling, which feels weird for carousel which should only swipe left/right
+        // if our carousel content is properly sized to be <= the carousel height. When written this wasn't be an issue, 
+        // but it would be easy to introduce a small layout issue in the future which oversizes the content.
+        self.carouselView.contentSize = CGSize(width: self.carouselView.contentSize.width, // use actual content width
+                                               height: self.carouselView.frame.size.height) // but crop height to frame
+    }
+
+    override func loadView() {
+        self.view = UIView()
+        view.backgroundColor = UIColor.white
+
+        let splashView = UIView()
+        view.addSubview(splashView)
+        splashView.autoPinEdgesToSuperviewEdges()
+
+        let carouselView = UIScrollView()
+        carouselView.delegate = self
+        self.carouselView = carouselView
+        splashView.addSubview(carouselView)
+        self.carouselView.isPagingEnabled = true
+        carouselView.showsHorizontalScrollIndicator = false
+        carouselView.showsVerticalScrollIndicator = false
+        carouselView.bounces = false
+
+        // CarouselView layout
+        carouselView.autoPinEdge(toSuperviewEdge: .top)
+        carouselView.autoPinEdge(toSuperviewEdge: .left)
+        carouselView.autoPinEdge(toSuperviewEdge: .right)
+
+        // Build slides for carousel
+        var previousSlideView: UIView?
+        for experienceUpgrade in experienceUpgrades {
+            let slideView = buildSlideView(header: experienceUpgrade.title, body: experienceUpgrade.body, image: experienceUpgrade.image)
+            carouselView.addSubview(slideView)
+
+            slideView.autoPinEdge(toSuperviewEdge: .top, withInset: ScaleFromIPhone5(10))
+            slideView.autoPinEdge(toSuperviewEdge: .bottom)
+            slideView.autoMatch(.width, to: .width, of: carouselView)
+
+            // pin first slide to the superview
+            if previousSlideView == nil {
+               slideView.autoPinEdge(toSuperviewEdge: .left)
+            } else {
+                // pin any subsequent slide to the preveding slide
+               slideView.autoPinEdge(.left, to: .right, of: previousSlideView!)
+            }
+
+            previousSlideView = slideView
+        }
+        // we should never be presenting a blank slideshow.
+        // but if so, we don't want to crash in prod.
+        assert(previousSlideView != nil)
+
+        // ping the last slide to the superview right.
+        previousSlideView?.autoPinEdge(toSuperviewEdge: .right)
+
+        // Previous button
+
+        // Lightening the arrows' color to balance their heavy stroke with the thinner text on the page.
+        let arrowButtonColor = UIColor(red: 0.1, green: 0.1, blue: 0.1, alpha: 1)
+        let previousButton = UIButton()
+        self.previousButton = previousButton
+        splashView.addSubview(previousButton)
+        previousButton.isUserInteractionEnabled = true
+        previousButton.setTitleColor(arrowButtonColor, for: .normal)
+        previousButton.accessibilityLabel = NSLocalizedString("UPGRADE_CAROUSEL_PREVIOUS_BUTTON", comment: "accessibility label for arrow in slideshow")
+        previousButton.setTitle("‹", for: .normal)
+        previousButton.titleLabel?.font = UIFont.ows_mediumFont(withSize: ScaleFromIPhone5To7Plus(24, 48))
+        previousButton.addTarget(self, action:#selector(didTapPreviousButton), for: .touchUpInside)
+
+        // Previous button layout
+        previousButton.autoPinEdge(toSuperviewEdge: .left)
+        let arrowButtonInset = ScaleFromIPhone5(200)
+        previousButton.autoPinEdge(toSuperviewEdge: .top, withInset: arrowButtonInset)
+
+        // Next button
+        let nextButton = UIButton()
+        self.nextButton = nextButton
+        splashView.addSubview(nextButton)
+        nextButton.isUserInteractionEnabled = true
+        nextButton.setTitleColor(arrowButtonColor, for: .normal)
+        nextButton.accessibilityLabel = NSLocalizedString("UPGRADE_CAROUSEL_NEXT_BUTTON", comment: "accessibility label for arrow in slideshow")
+        nextButton.setTitle("›", for: .normal)
+        nextButton.titleLabel?.font = UIFont.ows_mediumFont(withSize: ScaleFromIPhone5To7Plus(24, 48))
+        nextButton.addTarget(self, action:#selector(didTapNextButton), for: .touchUpInside)
+
+        // Next button layout
+        nextButton.autoPinEdge(toSuperviewEdge: .right)
+        nextButton.autoPinEdge(toSuperviewEdge: .top, withInset: arrowButtonInset)
+
+        // Dismiss button
+        let dismissButton = UIButton()
+        splashView.addSubview(dismissButton)
+        dismissButton.setTitle(NSLocalizedString("DISMISS_BUTTON_TEXT", comment: ""), for: .normal)
+        dismissButton.setTitleColor(UIColor.ows_materialBlue(), for: .normal)
+        dismissButton.isUserInteractionEnabled = true
+        dismissButton.addTarget(self, action:#selector(didTapDismissButton), for: .touchUpInside)
+
+        // Dismiss button layout
+        dismissButton.autoPinWidthToSuperview()
+        dismissButton.autoPinEdge(.top, to: .bottom, of: carouselView, withOffset: ScaleFromIPhone5(16))
+        dismissButton.autoPinEdge(toSuperviewEdge: .bottom, withInset: ScaleFromIPhone5(32))
+    }
+
+    private func buildSlideView(header: String, body: String, image: UIImage?) -> UIView {
+        Logger.debug("\(TAG) in \(#function)")
+
+        let containerView = UIView()
+        let headerView = UIView()
+        containerView.addSubview(headerView)
+        headerView.backgroundColor = UIColor.ows_materialBlue()
+
+        headerView.autoPinWidthToSuperview()
+        headerView.autoPinEdge(toSuperviewEdge: .top, withInset: -16)
+        headerView.autoSetDimension(.height, toSize: ScaleFromIPhone5(100))
+
+        // Title label
+        let titleLabel = UILabel()
+        headerView.addSubview(titleLabel)
+        titleLabel.text = header
+        titleLabel.textAlignment = .center
+        titleLabel.font = UIFont.ows_regularFont(withSize: ScaleFromIPhone5To7Plus(26, 32))
+        titleLabel.textColor = UIColor.white
+        titleLabel.minimumScaleFactor = 0.5
+        titleLabel.adjustsFontSizeToFitWidth = true;
+
+        // Title label layout
+        titleLabel.autoPinWidthToSuperview(withMargin: ScaleFromIPhone5To7Plus(16, 24))
+        titleLabel.autoPinEdge(toSuperviewEdge: .bottom, withInset: ScaleFromIPhone5To7Plus(24, 32))
+
+        let slideView = UIView()
+        containerView.addSubview(slideView)
+
+        let containerPadding = ScaleFromIPhone5To7Plus(12, 24)
+        slideView.autoPinEdgesToSuperviewEdges(with: UIEdgeInsets(top: containerPadding, left: containerPadding, bottom: containerPadding, right: containerPadding))
+
+        // Body label
+        let bodyLabel = UILabel()
+        slideView.addSubview(bodyLabel)
+        bodyLabel.text = body
+        bodyLabel.font = UIFont.ows_lightFont(withSize: ScaleFromIPhone5To7Plus(18, 22))
+        bodyLabel.textColor = UIColor.black
+        bodyLabel.numberOfLines = 0
+        bodyLabel.textAlignment = .center
+
+        // Body label layout
+        bodyLabel.autoPinWidthToSuperview()
+        bodyLabel.sizeToFit()
+
+        // Image
+        let imageView = UIImageView(image: image)
+        slideView.addSubview(imageView)
+        imageView.contentMode = .scaleAspectFit
+
+        // Image layout
+        imageView.autoPinWidthToSuperview()
+        imageView.autoSetDimension(.height, toSize: ScaleFromIPhone5To7Plus(200, 280))
+        imageView.autoPinEdge(.top, to: .bottom, of: headerView, withOffset: ScaleFromIPhone5To7Plus(24, 32))
+        imageView.autoPinEdge(.bottom, to: .top, of: bodyLabel, withOffset: -ScaleFromIPhone5To7Plus(24, 32))
+        
+        return containerView
+    }
+
+    private func addDismissGesture() {
+        let swipeGesture = UISwipeGestureRecognizer(target: self, action: #selector(handleDismissGesture))
+        swipeGesture.direction = .down
+        view.addGestureRecognizer(swipeGesture)
+    }
+
+    // MARK: Carousel
+
+    private var carouselView: UIScrollView!
+    private var currentSlideIndex = 0
+
+    private func showNextSlide() {
+        guard hasNextSlide() else {
+            Logger.debug("\(TAG) no next slide to show")
+            return;
+        }
+
+        currentSlideIndex += 1
+        showCurrentSlide()
+    }
+
+    private func showPreviousSlide() {
+        guard hasPreviousSlide() else {
+            Logger.debug("\(TAG) no previous slide to show")
+            return
+        }
+
+        currentSlideIndex -= 1
+        showCurrentSlide()
+    }
+
+    private func hasPreviousSlide() -> Bool {
+        return currentSlideIndex > 0
+    }
+
+    private func hasNextSlide() -> Bool {
+        return currentSlideIndex < experienceUpgrades.count - 1
+    }
+
+    private func updateSlideControls() {
+        self.nextButton.isHidden = !hasNextSlide()
+        self.previousButton.isHidden = !hasPreviousSlide()
+    }
+
+    private func showCurrentSlide() {
+        Logger.debug("\(TAG) showing slide: \(currentSlideIndex)")
+        updateSlideControls()
+
+        // update the scroll view to the appropriate page
+        let bounds = carouselView.bounds
+
+        let point = CGPoint(x: bounds.width * CGFloat(currentSlideIndex), y: 0)
+        let pageBounds = CGRect(origin: point, size: bounds.size)
+
+        carouselView.scrollRectToVisible(pageBounds, animated: true)
+    }
+
+    // MARK: - Actions
+
+    func didTapNextButton(sender: UIButton) {
+        Logger.debug("\(TAG) in \(#function)")
+        showNextSlide()
+    }
+
+    func didTapPreviousButton(sender: UIButton) {
+        Logger.debug("\(TAG) in \(#function)")
+        showPreviousSlide()
+    }
+
+    func didTapDismissButton(sender: UIButton) {
+        Logger.debug("\(TAG) in \(#function)")
+        self.dismiss(animated: true)
+    }
+
+    func handleDismissGesture(sender: AnyObject) {
+        Logger.debug("\(TAG) in \(#function)")
+        self.dismiss(animated: true)
+    }
+
+    // MARK: - ScrollViewDelegate
+
+    // Update the slider controls to reflect which page we think we'll end up on.
+    // we use WillEndDragging instead of (e.g.) didEndDecelerating, else the switch feels too late.
+    func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
+        let pageWidth = scrollView.frame.size.width
+        let page = floor(targetContentOffset.pointee.x / pageWidth)
+        currentSlideIndex = Int(page)
+        updateSlideControls()
+    }
+}

Signal/src/view controllers/PrivacySettingsTableViewController.m

@@ -136,9 +136,9 @@ typedef NS_ENUM(NSInteger, PrivacySettingsTableViewControllerSectionIndex) {
         case PrivacySettingsTableViewControllerSectionIndexCalling:
             return 1;
         case PrivacySettingsTableViewControllerSectionIndexCallKitEnabled:
-            return self.supportsCallKit ? 1 : 0;
+            return [UIDevice currentDevice].supportsCallKit ? 1 : 0;
         case PrivacySettingsTableViewControllerSectionIndexCallKitPrivacy:
-            return (self.supportsCallKit && [[Environment getCurrent].preferences isCallKitEnabled]) ? 1 : 0;
+            return ([UIDevice currentDevice].supportsCallKit && [[Environment getCurrent].preferences isCallKitEnabled]) ? 1 : 0;
         case PrivacySettingsTableViewControllerSectionIndexHistoryLog:
             return 1;
         case PrivacySettingsTableViewControllerSectionIndexBlockOnIdentityChange:
@@ -157,11 +157,11 @@ typedef NS_ENUM(NSInteger, PrivacySettingsTableViewControllerSectionIndex) {
             return NSLocalizedString(@"SETTINGS_CALLING_HIDES_IP_ADDRESS_PREFERENCE_TITLE_DETAIL",
                 @"User settings section footer, a detailed explanation");
         case PrivacySettingsTableViewControllerSectionIndexCallKitEnabled:
-            return (self.supportsCallKit
+            return ([UIDevice currentDevice].supportsCallKit
                     ? NSLocalizedString(@"SETTINGS_SECTION_CALL_KIT_DESCRIPTION", @"Settings table section footer.")
                     : nil);
         case PrivacySettingsTableViewControllerSectionIndexCallKitPrivacy:
-            return ((self.supportsCallKit && [[Environment getCurrent].preferences isCallKitEnabled])
+            return (([UIDevice currentDevice].supportsCallKit && [[Environment getCurrent].preferences isCallKitEnabled])
                     ? NSLocalizedString(@"SETTINGS_SECTION_CALL_KIT_PRIVACY_DESCRIPTION",
                                         @"Explanation of the 'CallKit Privacy` preference.")
                     : nil);
@@ -274,13 +274,6 @@ typedef NS_ENUM(NSInteger, PrivacySettingsTableViewControllerSectionIndex) {
     [[Environment getCurrent].preferences setIsCallKitPrivacyEnabled:!sender.isOn];
 }
 
-#pragma mark - Util
-
-- (BOOL)supportsCallKit
-{
-    return SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(10, 0);
-}
-
 #pragma mark - Log util
 
 + (NSString *)tag

Signal/src/view controllers/SignalsViewController.m

@@ -39,8 +39,12 @@ NSString *const SignalsViewControllerSegueShowIncomingCall = @"ShowIncomingCallS
 @property (nonatomic) long inboxCount;
 @property (nonatomic, retain) UISegmentedControl *segmentedControl;
 @property (nonatomic, strong) id previewingContext;
+
+// Dependencies
+
 @property (nonatomic, readonly, strong) AccountManager *accountManager;
 @property (nonatomic, readonly) OWSContactsManager *contactsManager;
+@property (nonatomic, readonly) ExperienceUpgradeFinder *experienceUpgradeFinder;
 @property (nonatomic, readonly) TSMessagesManager *messagesManager;
 @property (nonatomic, readonly, strong) OWSMessageSender *messageSender;
 
@@ -78,6 +82,7 @@ NSString *const SignalsViewControllerSegueShowIncomingCall = @"ShowIncomingCallS
     _contactsManager = [Environment getCurrent].contactsManager;
     _messagesManager = [TSMessagesManager sharedManager];
     _messageSender = [Environment getCurrent].messageSender;
+    _experienceUpgradeFinder = [ExperienceUpgradeFinder new];
 }
 
 - (void)awakeFromNib
@@ -304,10 +309,18 @@ NSString *const SignalsViewControllerSegueShowIncomingCall = @"ShowIncomingCallS
 - (void)viewDidAppear:(BOOL)animated {
     [super viewDidAppear:animated];
     if (self.newlyRegisteredUser) {
+        [self.editingDbConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction * _Nonnull transaction) {
+            [self.experienceUpgradeFinder markAllAsSeenWithTransaction:transaction];
+        }];
+
         [self didAppearForNewlyRegisteredUser];
+    } else {
+        [self displayAnyUnseenUpgradeExperience];
     }
 }
 
+#pragma mark - startup
+
 - (void)didAppearForNewlyRegisteredUser
 {
     ABAuthorizationStatus status = ABAddressBookGetAuthorizationStatus();
@@ -341,6 +354,25 @@ NSString *const SignalsViewControllerSegueShowIncomingCall = @"ShowIncomingCallS
     }
 }
 
+- (void)displayAnyUnseenUpgradeExperience
+{
+    AssertIsOnMainThread();
+
+    __block NSArray<ExperienceUpgrade *> *unseenUpgrades;
+    [self.editingDbConnection readWithBlock:^(YapDatabaseReadTransaction *transaction) {
+        unseenUpgrades = [self.experienceUpgradeFinder allUnseenWithTransaction:transaction];
+    }];
+
+    if (unseenUpgrades.count > 0) {
+        ExperienceUpgradeViewController *experienceUpgradeViewController = [[ExperienceUpgradeViewController alloc] initWithExperienceUpgrades:unseenUpgrades];
+        [self presentViewController:experienceUpgradeViewController animated:YES completion:^{
+            [self.editingDbConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction * _Nonnull transaction) {
+                [self.experienceUpgradeFinder markAllAsSeenWithTransaction:transaction];
+            }];
+        }];
+    }
+}
+
 - (void)ensureNotificationsUpToDate
 {
     OWSSyncPushTokensJob *syncPushTokensJob =

Signal/translations/en.lproj/Localizable.strings

@@ -791,10 +791,10 @@
 "SETTINGS_BUTTON_ACCESSIBILITY" = "Settings";
 
 /* Table cell label */
-"SETTINGS_CALLING_HIDES_IP_ADDRESS_PREFERENCE_TITLE" = "Hide IP Address";
+"SETTINGS_CALLING_HIDES_IP_ADDRESS_PREFERENCE_TITLE" = "Always Relay Calls";
 
 /* User settings section footer, a detailed explanation */
-"SETTINGS_CALLING_HIDES_IP_ADDRESS_PREFERENCE_TITLE_DETAIL" = "Hiding your IP address during audio and video calls will decrease call quality.";
+"SETTINGS_CALLING_HIDES_IP_ADDRESS_PREFERENCE_TITLE_DETAIL" = "Relay all calls through the Signal server to avoid revealing your IP address to your contact. Enabling will reduce call quality.";
 
 /* No comment provided by engineer. */
 "SETTINGS_CLEAR_HISTORY" = "Clear History Logs";
@@ -836,7 +836,7 @@
 "SETTINGS_PRIVACY_CALLKIT_PRIVACY_TITLE" = "Show Names & Numbers";
 
 /* Short table cell label */
-"SETTINGS_PRIVACY_CALLKIT_TITLE" = "Use CallKit";
+"SETTINGS_PRIVACY_CALLKIT_TITLE" = "iOS Call Integration";
 
 /* No comment provided by engineer. */
 "SETTINGS_PRIVACY_TITLE" = "Privacy";
@@ -848,10 +848,10 @@
 "SETTINGS_SCREEN_SECURITY" = "Enable Screen Security";
 
 /* No comment provided by engineer. */
-"SETTINGS_SCREEN_SECURITY_DETAIL" = "Prevents Signal previews from appearing in the app switcher.";
+"SETTINGS_SCREEN_SECURITY_DETAIL" = "Prevent Signal previews from appearing in the app switcher.";
 
 /* Settings table section footer. */
-"SETTINGS_SECTION_CALL_KIT_DESCRIPTION" = "CallKit allows you to answer calls directly from your lockscreen. Be aware that when using CallKit, Apple syncs some call metadata to your iCloud account.";
+"SETTINGS_SECTION_CALL_KIT_DESCRIPTION" = "Show Signal calls on your lock screen and in the system's call history. If iCloud is enabled, call history will be shared with Apple.";
 
 /* Explanation of the 'CallKit Privacy` preference. */
 "SETTINGS_SECTION_CALL_KIT_PRIVACY_DESCRIPTION" = "If you show the names and phone numbers of incoming callers in CallKit, this information will appear in your phone's call history and will be synced to your iCloud account.";
@@ -949,6 +949,24 @@
 /* No comment provided by engineer. */
 "UPDATE_BUTTON_TITLE" = "Update";
 
+/* accessibility label for arrow in slideshow */
+"UPGRADE_CAROUSEL_NEXT_BUTTON" = "Show next";
+
+/* accessibility label for arrow in slideshow */
+"UPGRADE_CAROUSEL_PREVIOUS_BUTTON" = "Show previous";
+
+/* Description of CallKit to upgrading (existing) users */
+"UPGRADE_EXPERIENCE_CALLKIT_DESCRIPTION" = "Answering calls from your lockscreen is easy and private, since by default we anonymize your caller.\n\n Read more in your privacy settings.";
+
+/* Header for upgrade experience */
+"UPGRADE_EXPERIENCE_CALLKIT_TITLE" = "Just Swipe to Answer";
+
+/* Description of video calling to upgrading (existing) users */
+"UPGRADE_EXPERIENCE_VIDEO_DESCRIPTION" = "Signal now supports secure video calling. Just start a call like normal, tap the camera button, and wave hello.";
+
+/* Header for upgrade experience */
+"UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Upgrading Signal ...";