Stupid question, I'm sure, but curious. I'm on an iPhone 6 on Verizon. Old contract long expired, been month-to-month for awhile. Bought from Apple, later AppleCare replaced by Apple. When preordering the iPhone 7 via the Apple Store app, is there any difference between the "replace this phone" and the "purchase this phone... SIM-free" options? Am aware Verizon devices were valued for being unlocked, but at this point in hardware, is there a reason to buy one or the other? Is choosing "replace this phone" the same as buying a SIM-free device and putting my current SIM into it, just with fewer steps until having an active device?