u need to go to the tcp settings options>advanced options then tcp. make sure your tcp is correct. i use to have to apn= wap.cingular apn user=
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password= CINGULAR1. but mines says internet.com for apn and no user or pass. i think maybe it changed since at&t took over. make sure u go to host routing table and reregister your service books. i also have a tmobile unlocked pearl on cingular network.