When did the adhan become the call to prayer?

When the Muslim community migrated to Madinah, they faced all sorts of new questions – like when exactly is prayer time over here?

So the Prophet (peace be upon him) gathered the Companions to discuss the matter. Some suggested using a bell like the Christians, or a horn like the Jewish community, but neither were from the traditions of either the Arabs nor or the Muslims. A man then came forth and said, “O Messenger of Allah, I had a very beautiful dream…”

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Source: Faith IQ