There is a widespread belief that using some methods before selling your phone prevents anyone from retrieving your personal data on your phone, pictures, videos, messages, etc.
This belief was one of my personal principles too, but after the Dr.Fone application I changed my idea. After I took several steps to prevent my personal data from being retrieved before I sold it, these steps were to change the ROM and write on the phone area almost three times. With this new application I took back the photos after the experiment, as I tried other famous applications on Play Story and failed to retrieve any image.
http://cut-urls.com/FzzrJI9C
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Thank You - @blueorgy
You're welcome