Configure LG F9100 / LG MG170 GSM Phone from Mexico.

Well yesterday I bought a LG phone and got a T-mobile plan.Turns out the Phone is from Mexico. How it got to a store in Mass?Lord knows.Of course the configurations are all wrong but it works to some extent as far as talking and text messages go but features like T-zones don't work.So I'm looking for help solving the problem.

I've renamed your thread and moved it in hopes someone can help.

Thanks