Samsung Galaxy S III - Manual (Page 21)

Getting Started 15
6. Use the Volume Up/Down keys to scroll up or down,
then use the Power key to make a selection.
Safe Mode
You can boot your phone into Safe Mode if you wish to
troubleshoot whether or not added applications are causing
problems with the device. Safe mode will only load basic
system software.
1. Make sure your phone is turned off.
2. Press and hold the power key ( ) to boot up your
device.
3. After the animation starts to display, press and hold the
Volume Down key until the backlight turns on behind
the bottom keys.
4. Press and hold the key.
When the Home screen is displayed, Safe mode is
displayed in the lower left corner of the screen.
Troubleshooting
If your device has fatal errors, hangs up, or freezes, you may
need to reset the device to regain functionality.
Ⅲ If your device is frozen and unresponsive, press and
hold the Power/Lock Key for 8 to 10 seconds.
For more information, refer to “Android System Recovery”
on page 14.