7610 Sim Card Not Valid Error!!!

[REY619]

My 7610 was working fine till now, then some minutes ago i switched it off, then when i switched it back on it gives "Sim Card Not Valid" Error. The phone is not network locked, it was working fine some minutes ago... Just i restarted and it gives this error...
Please someone help!!
Thanx!

[outlaw]

try reinsertin the sim..

or maybe someone might have played with the security settings [pin code]

cuz i tried to change my pin code and ended up like that......

u'll get a duplicate sim card for 250 rupees ;

[REY619]

I started witout MMC and it worked... Must be a problem with MMC!!