Some times showing insert sim
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.
SOURCE: nokia N72
sounds like a manufacturer error....take the phones back to where you bought them from and have them exchanged
SOURCE: Insert SIM Card message in nokia 6080 though SIM is inserted
May be its detecting your sim card properly. Check your sim card in another handset. Verify if its the propbelm with sim card not your handset.
SOURCE: sim card not valid
Friend i have same cell phone and i am also facing this problem but dont worry
go to network menu and select Automatic network that problem will be solved if not them show it in to nokia care
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