I don't have the 600 yet, but I went to sprints site and clicked on the link at the bottom of www.sprintpcs.com for "Change your PCS Phone"

When I click on that , it says to make sure:

Have a new, fully charged PCS Phone (if you don't have a new PCS Phone, you can purchase one at the Sprint Store Online).
Be the account owner for the phone you are changing. If you are unsure, please check your invoice. Your name should appear at the top.
Make sure your old phone is not a PCS Vision Phone.
Make sure your new phone is not a PDA.

The last one says it cant be a PDA? Or does that mean make sure your old phone isn't a PCS vision phone *AND* your new one isnt a PDA?