Some people forgets to put off their mobiles in mosques as a result during namaz mobile starts ringing

One should ensure that his cellphone is completely switched off before Salaat. however, if ones mobile goes off while performing Salaah, he/she should try to switch it off in Salaah. However, it is important that in trying to off the phone your actions do not constitute Amal Katheer. Amal Katheer is doing an act in Salaah where an outsider will consider you not to be in Salaah. If Amal Katheer takes place, the Salaah will become invalid. Therefore, one should try and use one hand in a swift and appropriate manner to avoid the Salaah becoming invalid.

And Allah Knows Best

Mufti Ebrahim Desai