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O2 3G Mobile Broadband Dongle
Thankfully a lot of the places I need to go on the road means travelling from my home in Canterbury to London, or other places around the U.K. When I am on my home turf, or travelling from my house to the office or elsewhere, I can plug in the dongle and connect. Despite the U.K.'s somewhat patchy 3G and EDGE coverage, it generally powers me through the journey.
I have the option to tether my BlackBerry on my O2 mobile data plan but often choose not to. Tethering hits my BlackBerry's battery which could be used for other things during the day, and while many U.K. trains have Wi-Fi, I can't afford to churn up my Mac's battery on slightly-more-reliable Internet access, which often costs as much as a healthy kidney on the black market.