Open App Drawer and go to Settings  Wireless & networks More... Mobile networks Access point names Press ➕ button on top right corner. Enter name: Cingular
APN: wap.cingular
Proxy:
Port:
Username: wap@cingulargprs.com
Password: cingular1
Server:
MMSC: http://mmsc.cingular.com
MMS Proxy: wireless.cingular.com
MMS Port: 80
MCC:
MNC:
Authentication type:
APN type: default,supl,mms Keep default values for all blank fields shown above. Press menu button (top right) and select Save. Done. | 
