I own a AT&T iPhone 5 and switched to T-Mobile. The area I am in is supposed to get 4G LTE but I am stuck with 3G and sometimes even 2G(Edge) which sucks. I am not clear on the reason this is but I know it is because it is an At&t phone. I want to be able to receive 4G LTE. Is there anyway I can make this happen with tweeking the settings or something?