How to change an iPhone 4s from At&t carrier to T-Mobile?
I'm currently with T-Mobile and I have a Windows Phone, and I HATE my windows phone.
I have received an iPhone 4s from my grandma and she says I can have it, but the problem is that she used AT&T for the iPhone, and when I took the AT&T sim card out and replaced it with my T-Mobile sim card (There both the same size and fit), but the whole iPhone just restarted from the apple screen then it turned on, and when I was going through with the setup process and it connected to Wi-Fi, then it displayed a message saying SIM NOT VALID. THE SIM CARD THAT YOU CURRENTLY HAVE INSTALLED IN THIS IPHONE IS FROM A CARRIER THAT IS NOT SUPPORTED UNDER THE ACTIVATION POLICY THAT IS CURRENTLY ASSIGNED BY THE ACTIVATION SERVER. ITS NOT A HARDWARE ISSUE WITH THE IPHONE.
I don't want to spend money i'm saving up as much as I can and it costs $55 and I don't want to spend any money.
What can I do to get my iPhone to work from an AT&T to T-Mobile?
I think you have to buy a T-mobile SIM card that is actually registered for your phone and plan.
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