Just to recep, to get MMS working for VZW just do the following:
MMSC:
http://mms.vtext.com/servlets/mms?X-VZW-MDN=1234567890 (Replace with your number)
Port:80
WAP=None
There are more settings that you can do, but they are not really needed. This has been tested at least by me on MM War 1-3.5 and it works like a champ.
We still haven't figured out Sprint, but we plan on working on it again today.
Z