Callkit option should only be visible when "Video Call (Beta)" is enabled.

// FREEBIE

Signal/src/view controllers/AdvancedSettingsTableViewController.m

@@ -110,7 +110,7 @@ typedef NS_ENUM(NSInteger, AdvancedSettingsTableViewControllerSection) {
         case AdvancedSettingsTableViewControllerSectionLogging:
             return self.enableLogSwitch.isOn ? 2 : 1;
         case AdvancedSettingsTableViewControllerSectionCalling:
-            return self.supportsCallKit ? 2 : 1;
+            return ([Environment.preferences isWebRTCEnabled] && self.supportsCallKit) ? 2 : 1;
         case AdvancedSettingsTableViewControllerSectionPushNotifications:
             return 1;
         default:
@@ -214,10 +214,12 @@ typedef NS_ENUM(NSInteger, AdvancedSettingsTableViewControllerSection) {
     [[TSNetworkManager sharedManager] makeRequest:request
                                           success:^(NSURLSessionDataTask *task, id responseObject) {
                                               
+                                              AdvancedSettingsTableViewController *strongSelf = weakSelf;
                                               // Use the request id to ignore obsolete requests, e.g. if the
                                               // user repeatedly changes the setting faster than the requests
                                               // can complete.
-                                              if (enableWebRTCRequestCounter != enableWebRTCRequestId) {
+                                              if (!strongSelf ||
+                                                  enableWebRTCRequestCounter != enableWebRTCRequestId) {
                                                   return;
                                               }
                                               
@@ -225,6 +227,7 @@ typedef NS_ENUM(NSInteger, AdvancedSettingsTableViewControllerSection) {
                                               // otherwise local and service state will fall out of sync
                                               // with every network failure.
                                               [Environment.preferences setIsWebRTCEnabled:isWebRTCEnabled];
+                                              [strongSelf.tableView reloadData];
                                           }
                                           failure:^(NSURLSessionDataTask *task, NSError *error) {
                                               DDLogError(@"Updating attributes failed with error: %@", error.description);