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By default, Windows Phone devices in general and Lumia in particular will display an exclamation mark when touching the touch screen; In fact, this is considered redundant and entangled and most of us want to turn it off.
In the previous post, we showed you how to zoom in – out
INSTRUCTIONS FOR TURNING OFF EXCLAMATION MARKS (!) WHEN TOUCHING THE LUMIA TOUCHSCREEN
– Go to Settings (1)
Turn off exclamation marks when touching the Lumia screen
– System – System (2)
Turn off exclamation marks when touching Windows Phone
– Select Display (3)
– At the Show exclamation mark when you touch the screen (4) you swipe the icon to the left to turn it off.
Windows Phone screen with exclamation mark (!) when touched
https://Software/tat-dau-cham-than-khi-cham-vao-man-hinh-lumia-3718n.aspx
So Software has shown you how to turn off the exclamation mark when touching Windows Phone. With these applications users can