I want to buy a Verizon iphone 5 off-contract (device only) and use to finish out my AT&T 2-year contract, thus avoiding an ETF. My plan is to buy the phone and then get a nano-SIM card from AT&T to replace the micro SIM from my 4S. From all that I have read, the Verizon model comes unlocked. The rest of my family is on a Verizon family plan. This way, I can switch over with this phone to Verizon a) when my contract ends or b) when Verizon gets their simultaneous voice/data via Volt-E up and running (both factor into my decision). Plus I can hand this phone down to one of my children on Verizon when the next iPhone model is released next year. I realize I will only get HSPA+ speeds, not LTE, on ATT with this model but I can live with that. Anyone see any problems with this plan? Will ATT swap out the sim for me?