Samsung ATT_SGH_I727_CELOX_UM_KJ1_WC_102711_F7 - Manual (Page 19)

Getting Started 14
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 start-up animation begins to display, rapidly tap
the key until the Lock screen displays.
When the Lock 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.
ᮣ If your device is frozen and unresponsive, press and hold
the Power/Lock Key for 8 to 10 seconds.
For more help, see “Android System Recovery” on page 13.