Yes you can, but it is very expensive. AT&T/Cingular charge about $80 a month for unlimited data use. In order to maximise your utility I recommend a phone with EDGE capability the two phones that currently have EDGE are Nokia 6630 which can do ~ 140kbps and the Nokia 6230 which do around ~230kbps both speeds are theoretical best case speeds. Regular GPRS (which what the Moto offers you) will give you a theretical max of 56kbps.[/quote]
You can do it for less: Get the MEdia Works package for $19.99 a month. That gets you 1500 txt messages per month plus unlimited Wireless Internet Express, which is data. It's made for retreiving data with your phone's browser, but I've used it for laptop access. If you get it, I'd add it after you have service setup by calling up and talking to a rep and making sure you get unlimited data. I will say that for the few days that I used this for data access, I *was* charged an insane amount for data services, but when I called to fix it, I got the impression that it was because "someone forgot to turn on unlimited data". You might want to activate it, test it out for a day (which will give you an idea of the data speed anyway), cancel it and see if any data charges are added to your account beyond the cost of the 1 day, which is prorated (you'll get charged $19.99 on your next statement, then credited $19 and some change on the following statement).
Anyway, it worked for me, but try it at your own risk.