Is it prescribed for the imam to add to the reported phrases by saying: "Straighten your rows, stand close together, and turn off your mobile phones"?

Question:
Honorable Shaykh, may Allah grant you success. Some imams, given the prevalence of mobile phones and people forgetting to turn them off, say "Straighten your rows and stand close together" and then add "and turn off your mobile phones." Is this prescribed? Yes, he says some imams, when they say "Straighten your rows and stand upright," tell the ma'mum (those praying behind the imam) to turn off their mobile phones due to forgetfulness.

Answer:
Yes, there is no harm in saying "turn off your mobile phones" because of the need for it, as some people disturb the ma'mum with the sounds of their phones. Also, some of them put music on them; they put music, songs, and hand drums on them. This person has no shame; he has no shame. So the imam emphasizes this to them. Yes.