I used the instructions and MMS is working for me in the Little Apple, Manhattan, KS. At first it was only working when I turned off wifi. Then I read on another forum to update information in the MMS section of the Cellular Data Network on settings. I put in:
APN: wap.cingular
username:
wap@cingulargps.com
password: CINGULAR1 (case sensitive)
I left the other settings under MMS alone and now I can send and receive while having wifi turned on. It works just fine on EDGE. I can't wait to see how much faster it sends/receives the next time I'm in a 3G area like Topeka or Kansas City. Supposedly we're getting 3G in my town by the end of the year but I'm not getting my hopes up.