Invalid sim, this message appears on my IPhone 4S, sometimes on daily bases. Why?
Invalid sim, this message appears on my IPhone 4S, sometimes on daily bases. Why?
Try resetting
It could be caused by a bad electrical contact with the sim card, maybe try taking out and reinserting the sim card, make sure the sim card is clean (try carefully rubbing the contacts with a dry cloth, not with water).
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