unfortunately you have
This is actually incorrect. The Ismaili call the Adhan using the typical Shiite Adhan. The wording of this call can be read at the Related Link below.
Bilal (radiallahuanhu)
adhan
A Minaret. It is where the call of prayer (Adhan) is called from.
Merlin's mother's name is Adhan.
It is too precious and holy
The Muslims are found in almost all countries of the world. Wherever the Muslims offer their daily prayer Adhan is called there. Anyhow, there might be few countries where the Muslims don't reside.
A mu'adhin is a person who calls the prayer in other words the caller of the adhan
Hadrat Bilal al-Habashi
Because they want to
The call to worship for Muslims (followers of Islam) is called the adhan. It is made three times a day from the towers of a mosque, similar to the ringing of church bells. In modern times the adhan is often broadcast over loudspeakers.
A muezzin is the person who performs the call to prayer (adhan) at a mosque. The first muezzin was an Ethiopian man named Bilal ibn Ribah, who was a companion of the Prophet Muhammad (pbuh). Bilal was the first muezzin to perform the adhan in Makkah (Mecca).