I loaded WinMo6.1 from a link I found here on this site,
Found Here
(Which also includes versions for Sprint and Verizon and directions for how to flash it to the phone : the settings should be similar, though obviously not the same)
and input the following settings (via sms => menu => options... => advanced tab => Manual config edit...) and can now send and recieve MMS on Alltel's network.
Message center number: blank
Email center number: 8080
MMS Gateway address: blank
MMS URL:
http://mms-mt.alltel.net/servlets/mms
Network: Alltel Wireless (or whatever your internet connection is called)
I've sent and recieved pics and vid from people on Alltel, Verizon, AT&T, Sprint and T-mobile without any problems.
Hope this helps.
Obviously I can't promise that these settings will help everyone, but I felt it should be known that it works for someone.
PS. I didn't install any arcsoft mms or anything. Just installed the rom and input the settings, then a quick soft reset and BOOM!