If you’re recycling your computer, smartphone or tablet, there’s one significant problem you may have ignored. If you don’t wipe them clear of data, you could become a victim of identity theft. Deleting files, folders and applications won’t do the trick if you’re going to recycle your computer. Instead, you want to do a complete reset of your phone to wipe out its data and restore it to its factory settings. Get a disk-wiping program that meets the U.S. Department of Defense’s Media Sanitation Guidelines.”]
Source: https://www.csoonline.com/article/2132106/how-to-clear-your-data-off-a-device.html