help with GPRS for nokia 6020

hi, i bought a nokia 6020 GSM phone from t-mobile in germany, and am trying to use it with my Cingular SIM card here. it works great, apart from the GPRS--i can't seem to figure out how to change it off the -tmobile settings. any help?
thanks!

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When mine wasn't working i just called 611 and they sent the stuff to my phone or whatever and had me power my phone off and on and then it worked just fine from then on. Hope this helps considering my phone was actually from cingular...Good Luck