I used this guy's instructions a few minutes ago and it works perfectly for me:
http://www.everythingicafe.com/foru...e-3-0-mms-on-at-and-t-45087-2.html#post428813
This worked absolutely flawless for me, after hours of frustration. She had to push the updates to my phone twice, because while apparently it said that I did indeed have WAP/Push enabled, she said something changed after the second push and that's what did it. Give them a call, guys.