My Iphone rings but screen is blank held the power button for more than 10 sec but in vain

My Iphone rings but screen is blank held the power button for more than 10 sec but in vain

Hello waseem.abdul_hadi,
It may be that your Screen Curtain has been activated. This can be deactivated by triple-tapping the screen with three fingers.
Turn the screen curtain on or off. Triple-tap with three fingers. When the screen curtain is on, the screen contents are active even though the display is turned off.
iPhone User Guide - Use iPhone with VoiceOver
http://help.apple.com/iphone/7/
Cheers,
Allen

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