I have an 8310 and have had with and without data plan. Extremely good for PDA functions as that was the reason I bought the darn thing. Works great with Outlook 2007, as an MP3 player, read/edit word, view pdf, etc. You don't have to have a data plan. All that said, much more fun to have the data plan. Also much easier to install all of the free goodies available. Watch out though cause once you go data plan you don't go back.