What are my carrier options for an unlocked iPhone 4S or 5?

I'm looking to get an iPhone 4S, or preferably, 5 (once the unlocked ones are available in a few weeks), but since I'm not sure I'll be in America past next May, I'd like to get the unlocked version so I can have the option of using it abroad.

However, I need help figuring out which carrier I can use, contract-free, in the meantime. I barely need any minutes, but I want unlimited texts - unlimited data would be nice too.

Please advise!

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The only unlocked version of the iPhone 4S or 5 is on AT&T (GSM). GSM is the international standard for cell phone technology, so it works practically everywhere. If you want an unlocked one on Verizon or Sprint (CDMA), you can purchase one used online. But note the CDMA technology doesn't work in Europe and most other countries. The GSM unlocked iPhone 5 is $649, while the 4S is $549.

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