Originally Posted by Marciexyz
I'm afraid so. The enterprise data plan ($45) is for corporate e-mail (e-mail exchange server) and also gives you access to your personal e-mail. The personal data plan ($30) requires a compatible internet provider like comcast, att, pacbell.... The reason it is difficult to compare these data plans side-by-side is that one is typically listed under personal plans and the other is under the business heading. Bummer, huh?
Actually, I am connected to my exchange server and get all my emails and I have the $30 individual plan for the iphone 3G. No enterprise plan needed.