How to get 4G LTE with a AT&T iPhone on T-Mobile Service?

I own a AT&T iPhone 5 and switched to T-Mobile. The area I'm in is supposed to get 4G LTE but I'm stuck with 3G and sometimes even 2G(Edge) which sucks. I'm 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?

Your phone has to be unlocked before you switch over. If you can get 4G in some places but not others, then that is a network issue and not related to your phone (the maps are wrong). Finally, it's possible that T-Mobile and AT&T are using different frequencies for the 4G LTE band and your phone is capable of one but not the other.

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