@tg,
I do the "mms dance" that is mentioned in the NRG thread and use the files from there as well. Install the removal cab, soft reset, install the JD Arcsoft cab, soft reset. After that I go in and edit the server under "MMS Options". It has the Sprint server in it, so I have to add the Alltel one and set it as the default. I did a quick search for USCC settings and found this:
"gateway is blank
port is 80
Server Address is
http://mmsc1.USCC.net/mmsc/MMS
I believe"
You might need to do a little searching if those values aren't correct. I found mine here:
http://forum.ppcgeeks.com/showthread.php?t=19886
HTH,
sbl