[jonjon10002]

In about 2002, I had a Handspring Visor Prism, running PalmOS. I bought the VisorPhone, which was a cellular phone add-on that plugged into the back. It was somewhat ungainly, and didn't work well as a voice phone. It also had a separate battery, so you had to charge it on its own. I could use it as a cellular modem, but there wasn't a good practical use case for it, because there were only half-baked web browsers and few apps that used data. You could dial in to your desktop computer over the modem and sync remotely. It was fairly useless, but was the early precursor of what eventually became the Treo, and showed that the combination of cell phone and PDA was a good idea.