12. When the screen freezes

If the phone does not respond to user input or the screen freezes:

Remove the battery, insert it again and power on the phone. If it still does not work, please contact the service center.

13.Do not connect your phone when you power on/off your PC

Make sure to disconnect your phone from the PC via USB cable when powering your PC on or off as it might result in PC errors.

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LG Electronics MFL67008601, P509 manual When the screen freezes, Do not connect your phone when you power on/off your PC