My iphone 4 shows sim failure and then invalid sim, what should i do?
My iphone 4 was running on ios 5 and when i updated my iphone 4 to ios 6.1.3, i lost my network. I also tried reset network settings but it was useless!
Get a new SIM card it won't change anything i your phone and its free to get a new SIM card. Trust me i've had the same thing happen to my phone
Did you try removing and inserting back your sim? Or you can restore your iphone, if sim works after that remove the sim and update again. Then try inserting your sim back.
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