I kept carrying both a Palm T3 PDA and an old LG 8100 phone because the combination did everything I really needed. I did just a few things on the Palm:
- synched with Outlook (using the excellent Beyond Contracts from Dataviz)
- used a French-English dictionary
- read ebooks with a a free reader
- used an RPN calculator
- very occasionally made voice memos
The phone took acceptable pictures, had easy bluetooth-activated voice dialing, and had a really simple calling interface.
I finally migrated to a smartphone when the Droid came out, after saying for years that I'd wait until a single device could do everything I wanted at least as well as what I had.
Well, the Droid doesn't really fill that bill: I haven't yet found an Outlook sync that I like (though CompanionLink is getting close), and its phone doesn't work nearly as well with Bluetooth as my ancient LG phone did. Worst of all is its terrible reminder system which makes me think Google staff members use other devices or miss a lot of meetings.
I've been having a blast with the Droid in spite of its defects. My SlovoEd French-English dictionary is vastly better than the one I had on the Palm (and cost less, too). I've found a couple of RPN calculators, but none that I've found stores history on the SD card -- any pointers to one that does will be gratefully accepted. I've found temporarily tolerable workarounds to the synching weakness. I'm happy enough with the Aldiko reader that I made a contribution to the developers; it really is nicer than my old reader even if I haven't figured out how to get it to read the same books. And it turns out I don't actually make very many calls, so having a less-convenient phone isn't a big problem.
Having the web at my fingertips all the time is addictive. And having an open development platform means I'm fairly confident someone will step in with solutions to many of the phone's current shortcomings.