Notably, the USSD messages are up to 182 alphanumeric characters long. A typical USSD message starts with an asterisk (*) symbol followed by digits that comprise commands or data. Then it is terminated by a hash symbol (#). In some cases, the in-between commands or data might get separated by additional aster

This write up covers almost all Airtel operational ussd code including the Airtel balance check code.

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I have done all the work and listed out all the USSD codes and SMS codes for Airtel network, that might help you, when you want to airtel balance checking number, start/stop service and much more.