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make sure if sim reader is not pin damaged or water damaged? if problem persist i think you can connect your device without simcard and copy all data to your pc, then give some repairer to check maybe need to flash (if flash you will lose your data). or try to put your mobile without battery 2 days and then switch on to see may be this problem solves.with S.E. this problem a normal.
Try with another sim card, clean the sim connector of your phone, reset you phone to Factory Setting (default) using 12345. If you can open it, clean the mobile thoroughly using iPhone solution. This problem is caused by Firmware problem and Hardware problem as well. OR: New Software Reinstall in the Phone
i was purchase k310i on 18-12-2006,but given problem from dt.17-12-2006 if,set is ON than coming dialog Insert SIM ,
already SIM inside the set. I changed the 2nd sim ,but again
given same problum.please send the rectify this problum.
DIST.BHAGALPUR(BIHAR)PIN-813214,MOB-9431600406 OR06429-224194 OR 9430966487.
This problem is due to your phone's sim card IC malfunctioning. It may get damaged due to phone dropping gently into rough surface and its crystal structure may break due to it.
for any queries
mail to firstname.lastname@example.org
well... seem like you phone has got locked from the network may be accidently in case of stolen better check you service provider and if they say every thing is fine try to flash your mobile .it has some perticular number to flash it try these number *#7780# (password 12345)