Troubleshooting - Samsung SGH-i757M User Manual

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 7.
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