App testing on mobile, tablets.
Testing app UI on different resolutions.
App functioning in low battery, power saver mode, charging mode.
Testing app on different operating systems like iOS, Android, Windows.
Testing app behavior in low signal strength.
Testing touch Operations, ability to move application to memory card and
Compatibility of OS version to old/new SDK version.
Permission to on/off Bluetooth, WIFI, Mobile Data, Camera and Microphone access.
App behavior in portrait and landscape mode.
Check app behavior with Phone Calls/SMS.