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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.
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
1. its mainly due to Sim card get older and bend. So it cannot seat well in its slot. 2. Remove the Sim card. Check whether Sim card is normal. Due to the dust on the Sim also can cause this problem 3. May be the phone's Sim slot pin allignment problem. Check whether the all pins are good. 4. Some times when phone falls to the ground makes the Sim move from its slot. So also this problem occurs. 5. if problem persists even after these diagnosis methods. 6.Contact service centre for further Rectifcation. thank you