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If your Nokia 2630 phone displays an error message saying "Insert Sim" when you insert your sim card then your phone is probably sim locked.
To unlock it,visit the site Unlock-Zone.com here they are providing the permanent sim unlock code at reasonable cost with easy step by step unlocking instructions and unlock it. Unlock Zone Unlocking the Nokia 2630 mobile phone
Whether your Nokia N900 phone displays an error message saying "Insert Sim card" when you inserted a sim then your phone is probably network locked.
To unlock it,visit TheUnlockArena.com here they are providing the unlock code with easy step by step unlocking instructions and unlock it.
If your Nokia C7 phone displays an error message saying "Insert Sim (or) Sim card not valid" then your phone is probably network locked. To unlock it,visit the site OnlineGSMunlock.com here they are providing the unlock code at reasonable cost with easy step by step unlocking instructions and unlock it.Then you can use freely any GSM network Sim card.
First All Check: 1.Confirm whether same sim card is working in other h.s or not. 2.Make sure the sim slot is o.k. only try these two. 3.If all the above steps fails, check the SIM card connector pins for damage. if so try to get serviced. 4.if ur sim card is good then it is problum form sim card ic u have u raplace it with SMD. u can make it jumper mean u can fix this prob with out sim card is for this contact. 5.take sim connector slight up by pin then cheak by inserting sim. 6.hot air gun on sim i.c. then cheak it. Last Option: IF make sure that the sim card hasn't been damamged at all sO Please You Go to Service & Sim Office and Get the Duplicate Sim Same Your No From Office Oprator Problem will Solved Quickly
Friend, if it does.the sim card reader is disconnected or lesser
contact with your SIM or it maybe because of the dirt try cleaning it.
Or try to bend the SIM card guard metal a little to tighen the SIM and
get new sim card
phone carrier will copy whats on sim to new sim card i didnt get charged for this i dont think they will you either
the roaming overseas always changes parmeters of phone for some odd reason