When the Muslims arrived at Medina, they used to assemble for the prayer, and used to guess the time for it. During those days, the practice of Adhan for the prayers had not been introduced yet. Once they discussed this problem regarding the call for prayer. Some people suggested the use of a bell like the Christians, others proposed a trumpet like the horn used by the Jews, but ʿUmar was the first to suggest that a man should call (the people) for the prayer; so Messenger of Allah ﷺ ordered Bilal to get up and pronounce the Adhan for prayers.  

بَعْضُهُمْ اتَّخِذُوا نَاقُوسًا مِثْلَ نَاقُوسِ النَّصَارَى وَقَالَ بَعْضُهُمْ بَلْ بُوقًا مِثْلَ قَرْنِ الْيَهُودِ فَقَالَ عُمَرُ أَوَلاَ تَبْعَثُونَ رَجُلاً يُنَادِي بِالصَّلاَةِ فَقَالَ رَسُولُ اللَّهِ ﷺ يَا بِلاَلُ قُمْ فَنَادِ بِالصَّلاَةِ