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Working from home often means traveling around as well; often at your own expense. The trouble is that often you need to access the Web but can't find a hotspot without either forking out money for it, or discovering one that is fast enough. And if you rely on Starbucks and their Web speedy Web connection, you might need to do some work in private. Just think what your colleagues at the CIA would think about it.
What you need is a personal Wi-Fi hotspot. A Mi-Fi device connects to the cellular network under a pre-approved tariff, and allows you (and only you) to connect to it. It doesn't include any fiddly wires, and more often it's a case of 'plug-and-play' -- or whatever the wireless equivalent is.