CNN: Selling your old phone once you upgrade to a fancier model can be like handing over your diaries. All sorts of sensitive information pile up inside our cell phones, and deleting it may be more difficult than you think.
An American company, Trust Digital, bought 10 different phones on eBay this summer to test phone-security tools it sells for businesses. The phones all were fairly sophisticated models capable of working with corporate e-mail systems. Curious software experts at Trust Digital resurrected information on nearly all the used phones, including the racy exchanges between guarded lovers. The recovered information was equal to 27,000 pages — a stack of printouts 8 feet high.