These modems would often slot into a Mini PCI-e slot in the netbook motherboard. [delokaver] figured out how to use these 3G cards over USB instead. It’s actually a fairly straightforward hack.
There’s also four mini-PCI-E slots along the top ... and x1 PCI-E slot hanging off the side. Ports include a USB 2.0, a Cisco-style serial console port, two HDMI ports, and a Gigabit Ethernet ...