https://www.desidime.com/discussions/bsnl-sim-expiry-date-not-showing?page=1#post_9160341
Call 1800 180 1503 from Any Number or 1503 from BSNL Number and Press 2-1-9 to connect and ask them
Call 1800 180 1503 from Any Number or 1503 from BSNL Number and Press 2-1-9 to connect and ask them
try to send BAL on 123