"i m living in delhi and useing mtnl sim whenever i insert sim in phone, ph. is offline, when i serched network then it display ""insert sim card"" though i insert sim many times but ph. didn't read the sim? i used aircel,vodafone and airtel these all sim read by my ph. but not mtnl.I had checked in another ph. (Nokia x1-01) and it read mtnl sim but my nokia n97 can't. "