Answered by Shaykh Yusuf Weltch
Question
I was eating Sehri/suhoor and heard a faint sound from outside. I checked my phone, and since there were still nine minutes left until fajr, I continued eating according to the calendar (3:58 am). Then I went outside and heard the sound of one Azaan. I got confused and stopped eating. Then 9 mins later, I went outside to check whether there were any Azaans according to the Azaan calendar. (at 3 59 am) I heard several Azaans going off at once.
So can I dismiss the first Azaan as being before fajr? Since most mosques have Azaan according to the calendar, is the first early Azan worth worrying over? Is my fast valid?
Answer
In the Name of Allah, the Most Merciful and Compassionate
Your fast is valid; as long as you did not eat after the scheduled Fajr prayer time, according to your calendar, your fast is valid.
The call to prayer (adhan) is supposed to inform people of the prayer time and when it enters.
However, for multiple reasons, some mosques wrongfully call the adhan early. This is problematic, and the adhan must be repeated in such a case. [Ibn ‘Abidin, Radd al-Muhtar]
Summary
Pick a prayer calendar that you find consistent with most of the mosques in your area, or follow the prayer time charts made by those mosques. With this, you can be assured that your prayers and fasts are valid.
Hope this helps
Allah knows best
[Shaykh] Yusuf Weltch
Checked and Approved by Shaykh Faraz Rabbani