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I connected my phone thru the usb cable to the PC
and it said on the phone USB debugging something which i clicked
accidentally and right after i have this column on the top of the screen
with numbers n alphabets like on a graph but then every time i touch the screen
it leaves a line or dots!!
what did i do wrong?
how do i fix it?
tried resetting it or restarting it but it wont.
Sounds like you have some developer options enabled.
Go to settings > developer options > unmark everything in this menu.