USSD and SMS codes are most important for daily mobile usage. It is needed to check balance, activate or deactivate a particular service, etc. here we are listing some of the important USSD and SMS codes for BSNL mobile.
To Know mobile number dial *888# or *1#
To check main balance and validity dial *123# or *124*1#
To know plan details and to get the currently activated STV details, dial *124*2#
To activate data service on your number SMS START to 1925
To deactivate data service on your number SMS STOP to 1925
To activate ISD service on your number SMS ACT ISD to 1925