At Verizon, all PDAs except the Centro required data plans, and no other phones will take addresses or notes in the contacts application, which was a bust for me. I just got a Palm Centro with pay-per-KB and pay-per-message. The stores usually have one on hand behind the counter that you could play with.
If you're used to Blackberry or the like you will have to get used the the Palm OS, which is pretty intuitive once you play with it a little. Everything is very customizable through menus and preferences. The sound is great, it's got lots of convenient functions, works great as a phone and does everything a PDA can possibly do.
The only downside is that the battery isn't so great, though that might be because I'm constantly using the organizer. Customer service sent me a new one when I called to complain, so now I have two, and I'm considering an Ecosol Powerstick. Ordinarily I wouldn't tolerate worrying about the battery, but everything else about this phone is a joy.
Does Verizon offer a plan that includes one of their PDA/Smart Phones that doesn't require a monthly internet fee of $15, $30, $45, $60 or are those days history.
If not then is there a way to use something like an unlocked Samsung Omnia and use it with a Verizon plan while paying for internet on an "as needed" basis without a required monthly fee?