What sim is compatible with the iPhone carrier?

Answer In America, the two SIM-using GSM carriers are AT&T and T-Mobile.T-Mobile can only use it's EDGE network on an iPhone with a SIM Card needed.

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What carrier will the iPhone 4 g be with?

Well, 4g might be the next iPhone's name, but here is a list of current carriers in America:AT&TVerizon WirelessSprintC Spire Wireless (Mississippi)nTelos Wiress (Virginia)Appalachian Wireless (Ken... Read More »

What is A wireless service plan with a carrier that provides iPhone service in your area and do i need it for my iphone to work?

When will an unlock for iphone 4 with the latest software of 4.2.1 be available so that I can use my iphone on a different carrier then the one it is locked to?

I tried to JailBreak my Iphone 4 and now after it didn't work i decided to restore my phone ITunes is telling me my back up from my Iphone is corrupt or not compatible with my Iphone any advice?

It is now called the 4S, and yes, the 4 is now $99 for the 8gb model.