Shortly after they reviewed the HP Mini 1000, LaptopMag decided to pull apart the machine to get a closer look at the blood and guts of the tiny netbook. They discovered two major things – the RAM was easily upgraded via a plastic door covering the pre-installed DIMM and there was a slot in the battery compartment that fitted an AT&T SIM card. Assuming that the netbook lacked the internal hardware to support the 3G network, they just wrote this off as a possible future feature.
However, someone over at Pocketables Forum – after spending some time on the phone with both HP and AT&T – figured out how to put that SIM slot to work. Apparently the HP Mini 1000 does support the 3G network, all you need is a Multi-WWAN driver from HP and your SIM card from AT&T. The user, dplxy, divulges the rest of the setup instructions in his post. So far there doesn’t seem to be a driver for Linux users, although I’m sure anyone willing to dig around might be able to come up with one.