S710a Can't Go Online

I bought a S710a Unlocked from Ebay. I have Cingular, everything works fine from text to calling. I just can't go on AIM or online using WAP or EDGE. Any ideas?

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I kinda have the same problems with my s710a with Cingular. I've had the phone about two months now, and never ever have I ever been able to use the browser, text messaging and mms services successfully at the same time. Meaning that all three functions work in the same day. Sometimes the browser and mms work, but not text messaging. Nobody knows the deal-e-o. I think they have morons working at Cingular or something.