At the same time that kindly Mr. Vodafone released the Sony Ericsson Xperia Arc S to the children of the world, it announced a new program that helps you gauge your mobile data needs. Data Test Drive gives you three months of unlimited, kid-in-a-candy-van access for as much mobile Tweeting, Spotifying and YouTubing as your eyes and ears can handle. At the end of that period, the company will let you know if your current data plan would cover your usage and provide the option to increase if necessary. The program's only open to new customers, and there's no mention if you can down-shift your charges if you sip miserly at your data. Still, it's better than getting a slap in the face with the wet fish of a penalty data charge.