LG V935 User Guide

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Important notice
5. If the screen freezes
If the screen freezes or the device does not respond when you try to operate it:
Press and hold the 
Power/Lock Key and Volume Down Key for about 9 seconds to 
reset your device. To turn your device off, press and hold the 
Power/Lock Key and 
Volume Down Key for about 15 seconds. If it still does not work, please contact the 
service centre.