Is it permissible to interrupt the prayer to silence a ringing mobile phone if its ringing is prolonged, for fear of disturbing the worshipers and disrupting the congregation, especially if its ringtone is music or singing?

It is not permissible to interrupt a fard (obligatory) prayer except for a legitimate Shar'i (Islamic legal) excuse, such as killing a snake, fearing the loss of property, or assisting someone in distress. Therefore, it is not permissible to interrupt the prayer to turn off a mobile phone, as its ringing can be silenced with a slight movement that does not invalidate the prayer. Phone owners should turn off their phones before entering the mosque to avoid disturbing worshippers and to prevent forbidden musical tones.