Default Is somebody using a XDA in MEXICO?

One month ago i bougth a XDA (TMOBILE) in the USA. I live in Mexico and i try to use it with a local carriel (TELCEL). I use your very usefull program XDA Manipulator, it works!!! with the 6.02 radio version... i could unlock my xda and the phone is ok, but i have a new problem: i cant use it to go to the internet with GPRS or GSM. Can anybody help me?