Tap to open the main menu. From the main menu, go to Settings > Advanced Settings to see the following options:
|Prevent Auto-lock||This setting prevents locking the screen while you are on a call using the app.
|Dim screen during calls||You can enable this feature to dim the screen while you are an a call.|
|Emergency calls via cellular||Enable to dial the emergency number 911 through your standard cellular network.|
|Enable software echo cancellation||Provides echo cancellation on Android devices without built-in echo cancellation.|
Note: Synchronization may impact performance if your contact directory is large.