All the Airtel User need to know there balance, validity and many other things related to their service provider. The user has many questions in their mind which of them some are How to check Airtel balance? How to check data balance in airtel postpaid? What are airtel balance check number? What is Airtel balance check code? Forgetting all the information to check our remaining data, Balance, offers and other services we have used some specific numbers that start with * (Star) and ends with # (hash). The specific code or numbers is called Mobile USSD codes a.k.an Unstructured Supplementary Service Data. These codes act as a platform for mobile phone of a service provider companies for sending and receiving text messages and other mobile related services.