You may not realize it, but your smartphone contains a wealth of information. Everything from texts and e-mails to where you go, plus health and sleep information.
That includes data you've deleted.
"Even though you've deleted the content, it's actually still there, and the file system still can see it," said James Aquilina, a former federal prosecutor.
That data has become a source of debate as law enforcement fights devicemakers like Apple for access for the purpose of criminal investigations.
No matter where you stand on privacy issues, law enforcement has many tools to recover deleted information.
"We can … create essentially a timeline of how the phone was used and where the person was at any given time," said Aquilina, who now leads cybersecurity consulting firm Stroz Friedberg's digital forensics practice.