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Yes. The iPhone is unquestionably more useful to me than my Blackberry was, just because the app support and mobile browser is so good. I find myself using the data about 10x more often than I did with the Blackberry.

I haven't had a regular "free" phone since 2003, so it is hard to compare. Having constant access to email and the internets seems so essential now, I don't think I could rationally compare the value to of the iPhone to a phone that doesn't have a data plan.

Me. I ride the bus for 1 hour each day. I have 3G access all the way and am able to access email and web with ease. I have used this over and again to do actual work.

I wouldn't surprised if visual voicemail alone has saved me enough time to justify the cost.