Airtel Payments Bank will assign you an account number based on your phone number. Opening an Airtel Payment bank account is a straightforward process; you can do so at an Airtel outlet or using the Airtel Thanks app. Users need to call *400# for more information, using the Airtel number associated with their Airtel Payments Bank. My Airtel App allows you to find out your Airtel Payments Bank Account Number, or you can call the customer service line and get it after verifying your details.