Isn't it cool that there are so many choices out there ( BB, WM, Android, iPhone)?
Deciding amongst those what works best for your own individual needs sounds like a pretty nice problem to have.
It wasn't that long ago that the only PDA on the market was a Kyocera about the size of a VW Bug with a Palm OS.
1st Step in Troubleshooting: Do you have a BlackBerry Data Plan?
2nd Step in Troubleshooting: Pull the Battery.