Based on how AT&T marketed the original iPhone (below), it doesn't seem that they considered it to be a "feature phone" (à la Samsung SYNC, Moto RAZR/KRZR, LG Chocolate, etc).
"The most advanced browser ever on a portable device"
"Built-in Google and Yahoo! Search"
"Displays photos, images, PDFs, Microsoft Word and Microsoft Excel attachments"
"Uses a rich HTML email client"
"Synchronizes email while you multi-task"
"View maps and satellite images"
"Get directions and traffic information"
"A special YouTube player that you can launch right from the home screen"
"Email friends the link fast"
"Visual Voicemail"
"High-Quality Web Apps"
http://web.archive.org/web/20070711...tt.com/cell-phone-service/specials/iPhone.jsp
And none of that matters. As far as AT&T contract was conserned (and Apple at the time) it was a feature phone.
At the time it could not MMS, It could not install Apps which was something all smart phones could do.
Let me be clear I was not saying that it was not a smart phone. What I am saying in terms of the contract and how the phone was sold it was a very nice FEATURE PHONE.
3G got bumped to smart phone status and I believe that also when the App store was launched but does not change the fact that the first iPhone was considered a feature phone and its data plan was charged as such.