I am going to buy 2 iPhone X's (reselling 1 of them to offset the cost of the other) and I was wondering what carrier would be the best to order it for. While Verizon's devices are all unlocked, Sprint owns Boost Mobile. I don't know which would be easier/better to order from to get my phone. Also, will Apple require a signin/verification that it's my carrier before I buy them? They don't have any for specifically boost mobile, but perhaps Sprint login details would work? Thanks in advance!