I have a factory unlocked iPhone 5 that I got from an apple store but it does work with T-Mobile's new LTE network

Do you have a question?

T-Mobile in what country? And what country did you buy the phone in?

T-Mobile is not an authorized iphone carrier yet.

The T-Mobile iPhone 5 does not go on sale until April 12. I'm not sure of the bands that it will use, but it might not be the same bands as AT&T phones. Even if it does use the same bands, as LTE service is not yet officially available it probably won't work. Also, do you have an LTE SIM from T-Mobile?

And for the key question, have you asked T-Mobile why it doesn't work?

Message was edited by: Lawrence Finch

In addtion to having an LTE SIM your account must be provisioned for LTE. Note also tha T-Mobile's LTE deployment is just starting; they have very little coverage currently. And they don't tell you where they have it, except generally in terms of metropolitan areas.

I've read that as well. Assuming it is correct, why would you expect LTE to work on an iPhone you have in your hands today on the US T-Mobile network at all? Much less expect it to work before the announced availability date?

Before asking questions about something just announced, try reading some news or doing a little research on your own.

http://www.engadget.com/2013/03/26/iphone-5-att-aws-unlocked-plans-t-mobile/

Did you read the article in that link?