That area has not been announced for the refarming so it would be safe to expect 2G(Edge) data. Currently T-Mobile is working on adding 1900 MHz to towers to improve coverage for unlocked phones such as the I-Phone that share that frequency. With that said, 2G data speeds can be slow and would affect the performance of apps running on the device.
There is a Unofficial page dedicated to 3G service running on the 1900 frequency and a map to check out what other users get in such areas.
This is no way affiliated with T-Mobile. You can get a Nano Sim at a T-Mobile store only, it is not available online.
I hope that helps