verizon iPhones are unlocked due to a law imposed by the FCC.. spoke with a verizon agent about it as I am an australian in the USA, who regularly visits home. I am able to put foreign sims in my verizon phones. (i think its upward of the 5 model) will be unlocked. they don't commonly talk about this because they want to keep you on verizon.
I know this, but that does not stop amazon from doing whatever they want.