I used the guides on these forums for cingular to configure the 770. The w810i was configured with the following url:

http://sonyericsson.wdsglobal.com/wo...?contractId=12

Use this to configure your phone for edge, email, gprs and sms/mms. It will send the config to your phone and load it up with the right parameters. If youre still having problems check www.howardforums.com

BTW I am also using EDGE