I want a full price iPhone 5s that will be unlocked. 1. Where is the easiest place to pick one up or have one ordered? 2. Do I have to pay an activation fee if I buy one from AT&T, Verizon, or T-mobile in order to use it on an already activated SIM? 3. I went to an AT&T store and they told me I can only buy one full price iPhone 5s per *account*, not per line. Is this true? 4. If I go to Best Buy and buy a verizon or at&t phone, does it have to be tied to an account to buy it full price?