How to Enable 3G on T-Mobile with unlocked IPhone 4?

My phone is an unlocked AT&T Iphone, and I wonder how I can enable it so I can stop using this slow Edge speed. I'm on T-Mobile and it rarely ever connects to the 3G service. Is there a certain setting or something I can perform to fix this problem?

Probably nothing, t-mobile uses different frequencies that the other major mobile phone providers. There are several models of each iPhone, not all have the 3G & 4G frequencies which t-mobile uses.

With t-mobile purchasing metro pcs, they are gaining LTE & some other frequencies, which will soon be available with some luck.

You can't.

Unlocked AT&T devices will not work on T-Mobile's 3G network.

EDGE is as good as it gets.

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