T-Mobile: The site doesn't specifically say if it includes data (3G)
http://www.t-mobile.com/shop/phones/Detail.aspx?tp=tb3&class=prepaid&device=53299206-c069-429a-82fa-000007a2ac12

http://i141.photobucket.com/albums/r60/hereisaaron/t-mobile.png

This forum is pretty conclusive that data plan with T-mobile is impossible:
http://forums.mobiledia.com/topic55905.html


ATT:
Seems like ATT has a 19.99 monthly umlimited 3g data plan since May this year http://darlamack.blogs.com/darlamack/2008/05/att-prepaid-3g.html

Earlier this week AT&T began offering unlimited data on a prepaid basis. For a flat rate of $19.99 per month AT&T Prepaid users can select unlimited data. Better yet this data package takes advantage of their 3G network. On Friday I purchased the cheapest mobile I could find at a local store, a Motorola C168i. The phone comes with a SIM and $10 credit. I would have preferred another phone and if you have the patience or time I would recommend of the online specials. An added bonus AT&T currently gives a bonus $10 credit when $25 or more is added within 7 days of activation.

I would call the 1-888-4GOPHONE to find out how to activate a data plan with prepaid.

Cingular:

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