Background: I will be using my iPhone mainly for push email, calendar, contacts from my work's exchange server. I will also be trying to get a home comcast and gmail email to the iPhone. My account will be paid and maintained personally. (not through a corporate account) Questions: I've been told that because I want to get work email, I HAVE to get the Enterprise Date Plan and, thus, MUST get the iPhone at ATT. However, I see reports here that people are able to get connected to their exchange servers with personal data plans. Is there any REAL reason to get the Enterprise Date Plan? Does it get me anything other than a higher bill?