If it still showing insert sim, you can get a rubber eraser and erase the sim's chip. Also rub eraser on the part of the phone where sim is inserted.
Try to insert other sim cards if it is showing the same error. If yes, then you need to clean that part of the phone where sim is inserted. Try the rubber eraser technique. If it does not work, have a soft earbud cotton and dip in alcohol then gently rub it on that part.
1. Yes, that's true this might be ur handset's sim slot problem, to confirm about that inset another sim in ur handset, if ot doesn't work then go to nokia care.
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