The original Qualcomm pdQ wasn’t very good–I later described it as “a Palm glued to a phone.” It had all the functionality of a Palm 3 PDA and a typical CDMA phone of the late 1990s, but virtually no integration between the two sets of features. As I recall, you couldn’t even dial the phone by looking up a contact on the Palm and tapping the number. The only real advantage was that you got to carry one big device instead of two smaller ones. Needless to say, it sold poorly.
The followup pdQ a couple of years later was a more interesting product. By then, Qualcomm had sold its handset business to Kyocera, including the in-development pdQ 2. The revamped pdQ was a much more appealing product. It was much smaller than the original and offered some real integration of PDA functionality. It also borrowed the primitive Web-browsing capability of the Palm VII. Data communication in those days was limited to a theoretical maximum of 14.4 kilobits per second and you often did much worse than that, so the Palm system relied on pre-digested an condensed web snippets.
CLARIFICATION: Turns out folks at Qualcomm in addition to Paul Jacobs have fond memories of the pdQ. Engineers who worked on the project point out that there was some significant integration between the phone and the Palm including the ability to place a call from the Palm Address Book, a “find and dial” search for phone numbers across apps, Address Book search from the phone dialpad, and APIs to give third-party Palm developers access to pdQ phone features. These features don’t sound terribly exciting today, but they were breakthroughs in 1999.