How to solve 'invalid sim' on iPhone 4?
Ok. So I brought my iPhone 4 the other day of someone It's locked to t mobile. I put a new t mobile sim in the phone and its coming up as 'invalid sim' I checked if the phone is blocked and it isn't? So I'm confused to how I can solve this problem, any help?
It can't be locked to T-Mobile it can only be locked to AT&T.
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