Does iphone 5 on tmobile have 4g?

Just wondering if it only runs on 3g on T-Mobile or does it run on 4g

Yes but t mobiles 4g lte coverage is very limited right now

Well T-Mobile has recently released there T-Mobile in 116 cities covering 157 Million people. It all depends where you are located or are planning to be using TMo's service. But yes TMo's iPhone 5 supports 4G LTE and when it isn't in an area of 4G LTE it goes down to 4G HSPA+ 42.

Good luck

Here's a link to all the cities plus the devices that support 4G LTE. The iPhone isn't there but it should be.

http://support.t-mobile.com/...irect=true