There are some possible solutions:-
1. Check that your sim card is in perfect condition by insering the sim card in any other mobile phone... If the ssame error appears then it means the problem is in your sim card
2. Check that your sim card's slot is in perfect condition by insering any other sim card in your mobile phone... If the same error occurs then it means the problem is in your sim card's slot
3. Check that you are insering your sim card correctly or not
SOURCE: SIM card not valid
Hi thee, I list here the possible reasons for "Sim card not valid"
1 - The phone is locked to a different network. In this case the phone usually accept the sim card the same , and has no network, but sometimes it may return the error message. Unlock the phone at a local shop.
2 - the SIM card is faulty. Test the card on a different phone to find out.
3 - The phone is faulty. Test the phone with different Sim cards, if the Phone returns same error on all cards, then the phone is faulty.
SOURCE: SIM CARD REGISTATION FAIL
your phone must be inserted to a specially made nokia box in able to unlock your phone
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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