AIRTEL

*123*1# Local SMS Balance(GSM)
*123*2# Gulf SMS Balance
*123*3# Local Airtel to Airtel Balance
*123*4# Roaming account balance
*123*5# Monthly Balance
*123*6# STD Call Balance
*123*7# SMS(Local and STD) Balance
*123*8# Gulf call Balance @ 7/min
*123*9# Airtel to Airtel Night calling balance
*123*10# Dedicated account(SMS) Balance
*123*11# All in one balance
*135*2# Activate Missed call Alerts
*135*1# Deactivate Missed call Alerts
*121# Balance, Offer of the day, Helo tunes, Do not Call
*678# Hello tune menu including mobile search and Free zones