Under model, mine shows MD269LL. That translates into a black AT&T 64 gig 4S. An MD271LL indicates a white 64 gig AT&T 4S. Model MD277LL/A indicates a white Verizon 16 gig 4S. So....what does your say?
I ask because if the OP's iTunes shows a different color iPhone than what they have, what does the model indicate when going into settings, general, about? That's the real factor.