I purchased a sim card from bsnl in august. after three months the sim got discarded on its own for which the bsnl office again charged me the price of the sim to replace it with a new one on 21 october. but after 16 days of providing service the sim again got a problem . i was unable to send any message from this sim. again they got it replaced it for free this time on 6 nov. but still the problem is same that i am unable to send messages and they say we have no solution to it. and the mobile section of the office says that we dont know what is the problem. read full review »