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Call me paranoid, but I've always taken the time to delete every single message, every single contact before the master reset. I'm not even sure if THAT'S enough.
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.
Call me paranoid, but I've always taken the time to delete every single message, every single contact before the master reset. I'm not even sure if THAT'S enough.