What is the reason of announcing the inner-adhan (call to prayer) inside the mosques on Friday?

Please explain why there are two adhans for the Jumma prayers on Fridays... Thanks for your answers,right now...

Dear Brother / Sister,

The inner-adhan was called during the time of the Prophet (PBUH)). Outer-adhan was put into practice in the period of Caliph Uthman.

The Prophet (PBUH) greeted people when he entered the mosque, and when he ascended the pulpit, he greeted them again. It is called “the sitting of rest” Bilal  started  announcing the adhan , and when he was done, the Prophet (PBUH) recited a sermon including advice, after glorification of Allah. After sitting a while, he stood up and gave the second sermon and then descended from the pulpit. He led the congregation in the two-rakat Friday prayer after the iqamah was recited. He usually recited loudly, the surah al-Jumua (Friday) in the first rakat and the surah al-Munafiqun (Hypocrites) in the second rakat. The reason why he recited the surah al-Jumua in the first rakat was because the Friday prayer was the time when the number of the congregation is the highest and he wanted to teach them about the customs of the holy day Friday, and the reason why he recited the surah al-Munafiqun was because he wanted to warn them against the perils of the hypocrites. However, it is narrated that, in later times, he recited the surah al-A’la in the first rakat and surah al-Jathiya in the second rakat.

Although the prayer was performed in this manner during the Caliphate of Abu Bakr and Umar,during the Caliphate of Uthman, they needed an outer adhan because of the increasing population of the city. There were many people dwelling far from the mosque. It was announced in Zawra. After the Caliph Uthman, this practice was also adopted by the other cities and mosques. 80  years after Uthman, during the Caliphate of  Hisham b. Abdulmalik, Hisham ordered the adhan to be announced from the minaret of the mosque, which is in the middle of the city.

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