Full Azan need when iphone & ipad swich off

Assalamu walaikum. im iphone and ipad user. when prayer time, i cant hear full azan. when muslim pro open only this time hear the full azan. when prayer time, if i use other apps, this time i cant hear full azan. plz slove this problem. this apps is to good for the muslim umma...

Asif08 about Muslim Pro: Quran Athan Prayer