Khoushou3 automatically changes your phone's sound mode to vibrate/silent (you choose in settings) after you enter a Mosque that is in your map of Mosques.

Works mostly at your local prayer times, so no significant battery consumption.
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Follow in app tutorial to learn how to use it.
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Problems solved :

Changing sound mode manually every time you enter a Mosque;
Losing focus during Prayer, after you forgetting to change it;
Disturbing people by mistake.
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Make Prayer in a calm, free noise Mosque, achieve or at least be closer to Khoushou3 !

This app helps you avoid annoying, inconvenient phone call ringtones or sounds during your Prayer in Mosques.