Blackphone / Android:
1. Access Silent Phone's Settings and tap on 'Go offline'.
2. Launch Silent Phone again.
Alternatively, go to your device's Settings > Apps > Silent Phone and select the 'Force Stop' option. You can then launch Silent Phone again.
1. Press the home button twice to go into your multitasking menu.
2. Locate Silent Phone so it is in the center of your screen and swipe it up.
3. Go back to your home screen and tap on Silent Phone to open it.