Data, that is. PC World investigated some used phones at a flea market:
When I got home and charged the phones, I found so much information on both that I could have constructed an intricate portrait of each former owner’s life in the month before the phone left their hands. I had access to bank email, photos of family and friends, the nicknames the owners used for their parents--all for $60 and an afternoon at the flea market.
They also bought phones from various used phone sellers, and the results were interesting. Looks like you need to be very, very careful before you sell your old phone on e-bay...
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