I've bought a factory unlocked iPhone 5 from the online Apple store AFTER April, 12. The online consultant assured me that this model supports 3G/4G on T-Mobile networks, but I am getting only Edge speed around my area with an unlimited data prepaid SIM.
What I have tried:
(1) I have updated my iOS (6.1.3) and carrier software (T-Mobile 14.1).
(2) I have contacted T-Mobile online chat support, which was totally useless.
(3) Store manager at the local T-Mobile told me that there is no way to get 3G/4G on any unlocked phone.
(4) This map - http://airportal.de/ - shows 3G/4G at my area (Columbus, Ohio).
(5) I set up all the APN settings according to those presented on this website.
Can I get at least 3G? What should I do? I am really frustrated.