What is the ruling on answering a mobile phone during prayer by saying “Subhan Allah” to let the caller know that one is praying?

Question:
May Allah reward you. The honorable Shaykh says: A man is praying, and then his mobile phone rings, so he answers it while in his prayer by saying “Subhan Allah” to let him know that he is praying. What is the ruling on this?

Answer:
The ruling on this is that it does not invalidate the prayer. If one clears his throat, like the Prophet (peace and blessings be upon him) did when someone asked to enter while he was praying, he would clear his throat. This saying of “Subhan Allah” does not invalidate the prayer because it is a prescribed remembrance in prayer in its kind, so it does not invalidate the prayer. But I advise those who pray that they do not carry mobile phones, or if they do carry them, they turn them off when they do not finish the prayer. They turn them off when they are done with the prayer so they do not distract them while they are praying, or that they do not look at them with them in the mosque; they leave them in their homes or in their cars.