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Being a caller to prayer is an honor that shouldn't be granted to anyone. The one who recites Adhan and iqamah to remind all Muslims of their prayers must be honest, sane adult, trustworthy, and have a loud voice.
One of Muslims' favorite sounds should be the sound of Adhan. It is the reminder for one to perform prayers and once one hears it, he should repeat after it except for one phrase. Learn what you should say exactly.