Cao I buy a nokia lumia 1020 64gb from europe and unlock it for usa?

I want to get the nokia lumia, but after hearing there's no micro sd card (much like Iphone) I was skeptical, I found out that there was a 64gb version out for telefonica in europe… If I buy that one, can I unlock it and use it on t-mobile or at&t?

Added (1). 64GB… This is the key… If it isn't 64GB, I don't want it

Added (2). Unlocked 64GB… Where can I buy it? And will it work with At

Buy unlocked version at first.

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