Even I had same issue was awake all night with AT & T with respect to this issue (pending). So after a couple of hours, several attempts, I hung up, I was told to call back after finding a solution. Whatever! It was 3:30 am I was trying different combinations until I fainted. I woke up and was working! Off and on a couple of times. Keep working. Apply the same configuration on my wife Skyrocket's and now everything is working. So the ways to do it Menu> Settings> Wireless and network> Mobile Networks> Access Point Names. Menu> New APN.
Code:
Name: attwap (name it whatever you want)
APN: wap.cingular
MMSC: http://mmsc.cingular.com
MMS proxy: wireless.cingular.com
MMS port: 80
MCC: 310
MNC: 410
Then Save exit select the APN you created green dot exit that’s it Done.
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