To check the number on your Airtel SIM card, Dial *121# from your phone, You will be shown some on-screen options.

Select Manage My Account by pressing 2

You will be directed to the next screen showing,

1. My data balance
2. My Balance
3. My Data Plan
4. My Number
5. My tariff Plan
6. KYC status
7. My Serial Number
8. MY PUK

Select My Number by pressing 4 to reveal your phone number.

There you have it guys, the simple method on how to check Airtel number on your phone. If this guide has been helpful to you kindly share with other people who might need it.