1. Go into ‘Settings’ and scroll down to the ‘About’ tab. Select it.
2. There, you’d see a ‘reset your phone’ button.
3. Just tap on it, and confirm that you indeed want to delete all of your data.
4. A short wait of just a few minutes, and you’d have a factory reset phone. That’s it!
Note that this tutorial will work with the latest versions of Windows Phone with phones like the Nokia Lumia series windows smartphone