Dial 123 from your BSNL prepaid mobile to check main balance
Dial 124 or use the BSNL balance check USSD code available in your circle
Send an SMS with BAL to 123 to get balance details
Use the BSNL Selfcare app to view your prepaid balance
Log in to the BSNL website and check your account balance
Call BSNL customer care at 1503 for balance information
Check the balance details in the recharge confirmation SMS after recharging