Vibe app
Vibe is Phone & SMS tool that is open source under the GPL-3.0-only license. Tiny app to vibrate when a call is answered and/or has ended.Tested:
* Phone (com.android.dialer)
* Google Phone (com.google.android.dialer)
* Simple Dialer (com.simplemobiletools.dialer)
Permissions:
* NOTIFICATION_LISTENER - scan for a call answer or end
* VIBRATE - notify when a call is answered or has ended
It is Free Open Source Software.
License: GPL-3