I had my own single-line plan on T-Mobile with my 5S on their Jump program. I paid off my ETF and went to AT&T because T-Mobile's service is TERRIBLE where I live. I want to pre-order the 6 Plus tomorrow, but on AT&T's website it says I'm not eligible for an upgrade until October 12th? What gives? I thought I could upgrade at anytime if I have no contract. I'm thinking of buying the phone off-contract anyway, but where can I pre-order an unlocked one for use on AT&T?