I have a factory unlocked iPhone 4s which was working perfectly fine until I upgraded to another phone. Now, when I insert my sim into the 4s, its saying no sim or invalid sim. I'm not sure what the problem is but its running ios 7.1 and I want to avoid updating it to ios 8. Any suggestions?
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iPhone 4s No Sim
- Thread starter sicdeath
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Even being unlocked the 4S may not be able to use ANY SIM card.
What carrier is the SIM card for?
What carrier is the SIM card for?