Setting up a USB 3G/4G modem on a Raspberry Pi is not a simple task. There are many guides available using the now defunctsakis3g script, but getting my modem to work required a bit more understanding. The main problem is that most USB modems act as two devices - a USB storage device and a USB modem. When plugged in to the Raspberry PI the device is usually in USB storage mode. There is a program calledusb_modeswitch that we can use to do the switching The other missing part is a way to connect to the cellular network with the USB modem from the Raspberry. For this we will use the classic pppand wvdial programs.