They won't do it now. The manager said they used to offer to take back in the first few months but not any more. They said the correct method to truly get a SIM free phone was to insert a Verizon sim into the phone when you first bought it.. and it will unlock it for life because Verizon does not lock their phones. Insert any other SIM (Sprint, AT&T, T-mobile) into the Best Buy Sim-Free iPhone 7 will lock it to the first carrier sim inserted. This is pretty crazy. A lot of people found out about it in the first few weeks because they needed it unlock for oversea. We didn't find out until months later but is too late now. Best buy is saying that Sim-Free is not Unlock. The only Unlock iPhone is from Apple Store. But not all the employees of Best Buy know about this... they were telling people it is unlock because you could put any sim into it.. little do they know it will lock the phone to the first US carrier sim.