What Android settings should I set for optimized 3CX app operation on a OnePlus device?

For Android 11 (8 Pro):

  • Lock the app in recently used apps: (a) Open the 3CX app, then tap to open recent apps (standard Android square button). (b) Long-tap on the 3CX app preview until the menu appears. (c) Select ‘Lock’ to keep the app active for notifications.