If you're looking to totally clear out your Samsung Galaxy phone and start again, simply follow these easy instructions to master reset your Samsung Galaxy phone.
1. From the home screen of your Samsung phone swipe towards.
2. Select Settings.
3. Now find and press General Management.
4. Tap on the Reset option.
5. Now select Factory Data Reset.
6. Find and press Reset.
7. Finally, tap on Delete All.
Please be aware that this will delete all media and data and will reset all previous settings. It is recommended you back up any music, photos etc you want to keep before carrying out this reset.