here is the apn to send mms and use att internet, if something isn't listed then leave it blank.
Name: (whatever you want)
Apn: wap.cingular
Username: wap.cingulargps.com
Password: cingular1
Mmsc:
http://mmsc.cingular.com
mms proxy: 66.209.11.32
mms port: 8080
mcc: 310
mnc: 410
hope this helps everyone