I'm just hoping these settings will be working on your phone. I found them while I was browsing the Internet.
  • AT&T

    GPRS Settings:

    Homepage: http://device.home
    Access Point Name: wap.cingular
    Gateway IP Address: 66.209.11.61
    Port: 9201
    Authentication Type: Secure
    Login Type: Automatic
    Username: WAP@CINGULARGPRS.COM
    Password: CINGULAR1

    MMS Settings:

    Service Name: MMS
    Server Name: http://mmsc.cingular.com
    Web Session Name: MMS