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How To Check BSNL Data And SMS Balance?

Here's how to check BSNL data and SMS balance.
Open the calling app and dial *123*10# to check the 2G data balance
Dial *112# to check the 3G data balance for your BSNL number
Dial *124# to check the 4G data balance
Use *123*1# or *123*5# USSD codes to know the SMS balance for your BSNL number