With a little bit of luck (if they don't find you mistreated the phone) repair will be under warranty, so free.
Kees
Hello,
I bought new Note 4 3 months ago, but recently I encountered a problem.. Little dots in different colors (like snow but colored) are there on the right side of my screen.. Half the screen is covered by these coloured snow or sometimes its freezes.. This half of display doesn`t make any problem in functioning of my phone....
Any advice except repairing??

Chowhound
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GameFAQs
GameSpot
Giant Bomb
TechRepublic