Can I use a Verizon-built iPhone on AT&T?

Just got an unlocked iPhone 4 built to the Verizon specs thinking I would be switching to Verizon. Now I might be sticking with AT&T, so I'm wondering if I can stick a SIM card in it and use it? Also, might I be able to do the same thing in Europe on the Orange network?

I'm no expert on this, but AT&T is a completely different network than Verizon… I think it's called GMA… I can't remember. All I know is that when I was looking for an unlocked phone, (I have Tmobile) that I had to find either an AT&T or a Tmobile one, because they use the same network. Verizon, Sprint, and the other ones use a different network. Long story short, no, I don't think it'd work. As for the second half of your questions, my apologies, I don't know.

Maybe, AT&T is a GSM network while Verizon is a CDMA network. You can, if your Verizon iPhone is both GSM & CDMA, I don't believe it is, does it has a SIM card slot for a GSM SIM card.

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