You'll also get a lot more battery life if you turn the radio off. For example when I went to Bermuda, I didn't want to get charged for the emails I would be getting but I still wanted my alarm and calendar to work so I kept the radio off and it lasted all 9 days I was there on a single charge..And I still had 3 links of battery left on the plane home. So if you want to conserve battery as well you can turn the radio off.
-Unlimited Data Plan-which does come w/ wap.cingular access point included heh
Any Questions, feel free to PIN!
Also, to save battery.. if your in an area were it's really hard to get a connection and let say that your gonna be there for a while, it's better to turn it off. It helps you save up some battery life.