Question: May Allah be good to you, should the Imam, when the iqamah is called, always notify the people to turn off their cell phones after or before straightening the lines? This is due to the what occurs of disturbances during the prayer due to phones ringing and even with prohibited musical ringtones?
Answer: “Yes, the Imam notifies those praying about everything that disturbs the praying people or causes disorder. Even these cell phones, he notifies them about them. He says to them: “straighten the lines, keep straight, fill the gaps”. If there is anyone disturbing them he says to them: “do not disturb with such and such”. Yes, upon you is tranquility. Yes”.
Faisal Ibn Abdul Qaadir Ibn Hassan