Inserted T-Mobile SIM card, took a few seconds to detect T-Mobile connection and was able to download apps and received texts. Looks like full price iPhones are unlocked (on GSM at least). Let me know if you have any questions.
could you buy it without an at&t number though? they didn't let me, ended up finding a TMO store that carried some
Does the LTE work for t-mobile?
It does but it doesn't work well in my area. If I'm on LTE, I have 2-3 bars. 4G gives me 4-5 bars. I'm not sure how that works... :/ But LTE does have a 2-3 Mb speed boost. I can only imagine what LTE is like with full bars.And since I upgraded from a 4S, there's a huge difference between the two. The upgrade was really worth it since I get a larger screen and LTE. TouchID, M7 and all that jazz are just nice bonuses.