Unlocked iPhone for t mobile?

I currently have a Samsung galaxy s blaze 4g for t mobile. I'm under a 2 year contract with 2 other people. Can i order an unlocked iPhone online and just put that Sim card in it without any problems?

and i know the iPhone is supposed to come to t mobile in march but my upgrade isn't available till 2014.

Yes, but you are limited to EDGE (2G) data, no MMS, problematic texting and Siri only will work over Wi-Fi.

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