Default Europe EVO 3D in America

I'm going to America for 8 months(Ferris State University, Michigan) and I would like to take my EVO 3D GSM with me.. but will it be useable?

I did read something about a GSM network in America(straightalk or t-mobile) or are they on a completely different frequency? Because then I would need to buy another phone there.

Sent from my HTC EVO 3D X515m using xda app-developers app