However, one obvious drawback of this solution is that your friend might not be in close proximity to you or may not be responsive when you urgently need to know your mobile phone number details. C) Reach out for Help to Airtel Customer Service Representatives This is yet another easy and simple way to get to know your sim card mobile number. Here's what you should do to check your Airtel mobile number. Dial 121 from your phone's keypad. Follow the assistant, who will be an IVR, and select numbers based on your needs. Here are the many USSD dial codes you can use to inquire about Airtel's services. We would like to show you a description here but the site won’t allow us. Learn how to find your Airtel mobile number using USSD codes, the Airtel Thanks app, customer care, phone settings, or calling a friend. This tutorial also covers how to check the mobile number owner name and the mobile number in Aadhar card.