Mobile How Fast Does Your Phone Lose Value? By Allison McCann May 16, 2013 Britain’s CompareMyMobile.com tracks trade-in depreciation for more than 4,000 phones from 47 manufacturers. Here’s the change in value between Jan. 1 and May 15. Slideshow: How Fast Does Your Phone Lose Value? Story: EcoATM, the Automated iPhone Pawnshop Story: The Deadly Tin Inside Your Smartphone Story: Your Text Messages, Saved Forever McCann is a contributing graphics editor for Bloomberg Businessweek. Follow her on Twitter @atmccann.