If you want your Galaxy S4 to appear as brand new from a software standpoint, you have to reset it to factory settings.
Once it’s done, the phone will go through the standard initial setup procedure that all new Galaxy S4 phones go through.
To reset Galaxy S4 to factory settings, you can choose either one of the 2 methods:
Note: Resetting Galaxy S4 to factory settings DOESN’T wipe out the data in external memory card.
i. Factory reset via Settings
- On your Galaxy S4, go to home Settings > Account tab > Back up and reset > Factory data reset.
- Tap Reset device.
- Next, you will be prompted for a confirmation, tap Delete All.
ii. Factory reset using power and volume buttons
If for some reason you can’t get into the Settings to initiate the reset, try the method below:
- Power off your Galaxy S4.
- Press and hold the Volume Up + Home + Power buttons at the same time.
- Release all buttons as soon as you see the Samsung Galaxy S4 logo.
- In the Android system recovery mode, use the volume rocker to highlight wipe data/factory reset, and then press the Power button to select.
- Select Yes — delete all user data.
- Next, select reboot system now.