I am not going to a 2 year contract. Just want to know if I can order the unlock 5s from apple on Sep 20. I remember when iPhone 5 came out, they started to sell unlock phone 2 months after release. Do I have to wait 2 months for 5s? It seems there will be only T-mobile unlock 5s. I assume it also works with AT&T but not Verizon or Sprint? Thanks.