*123# – check Airtel mobile balance
*123*10# – check Airtel internet balance
*123*7# – check Airtel SMS balance
*123*11# – check Airtel 3g data balance
*123*10# – check Airtel 2g data balance
*121*8# – check Airtel 4g data balance
*123*197# – check Airtel Night Data balance
*121*1# – check Airtel Minutes Balance
*123*6# – check Airtel Night Minutes Balance
121 – Airtel Customer Care Number
198 – Airtel Complaint Number
*282# – check your own Airtel Number
*888# – check missed calls and notifications
*566# – check special offers from Airtel