So you’ve decided to sell your old cell phone and make some extra money,but before you do that,think again.

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.

A popular practice among sellers, resetting the phone, often means sensitive information appears to have been erased. But it can be resurrected using specialized yet inexpensive software found on the Internet.

A company, Trust Digital of McLean, Virginia, 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.