Most folks know enough to factory reset their Android phone before selling it, but few probably realize their dirty little secrets and naked selfies may still be lurking there.
Avast purchased 20 previously-owned Android smartphones from eBay; each had been “wiped” according to the manufacturer’s factory reset directions, but by simply using off-the-shelf digital forensic software such as FTK Imager, Avast recovered “more than 40,000 personal photos, emails, text messages, and – in some cases – the identities of the sellers.”