Mifi is a portable wireless router available from 3 and Vodafone. you stick your sim card in it and it connects to the mobile network. You can then connect upto 5 devices to it wirelessly. So that means you dont need a linux compatible mobile dongle. You just connect to this device via the wifi connection on your Pandora and providing there is coverage ;-) you can connect to the net. Its basically creates a wirless access point that you "own". £50 for the device on PAYG.