Yea, so I called nextel today. Turns out the dumbass that set it up did it wrong. I now have two way messaging, and Nextel changed their plans yesterday for web. Apparently now, with the $10 a month datathing, you get mobile aim. Not shitty sms mobile aim either, it's a whole application thing on the phone. Even on my i700. Plus you can do MSN messenger too. eeeewwwww.
Get one now, damnit.