These modems would often slot into a Mini PCI-e slot in the netbook motherboard ... figuring out which pins are used to talk to the SIM card, and soldering them up to a SIM adapter, or directly ...

Mini PCI is a subset of the PCI interface that uses a significantly smaller card form factor. Supporting only 3.3 volts and 32 bits of the PCI specification, Mini PCI was designed for peripherals ...