Yes, #DATA (#3282) should give you your data usage. Sometimes it works, sometimes it doesn't. In a corporate account, they probably don't even look at the individual phones and data traffic. And AFAIK, no one has ever been kicked off from overusing a phone. Only the data cards.

As for data usage, yeah, MegaZone has it about right. I know it takes about 4 hours to transmit 1 Gig of data with my 768 kb/s uplink. The Treo is roughly at 384 Kbps in typical speed. So that means it takes 8 hours to transmit 1 Gig. That equates to 40 hours for 5 Gigs. And if you drop the speed more, you get even more time. That's a fair amount of TV for the month.

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I very often connect my Treo to my laptop while on the road and use PDAnet software to connect to the internet. There are many times where I am online for a few hours at a time, this can go on for a couple weeks depending on how long I am traveling. So far this month I have used only 75MB worth of data. I think to reach 5GB it would take a TON of online time, and it would almost seem like a chore to get to that point.