Phone can not set wallpaper

Apr 12, 2018
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As said I am using the Samsung Galaxy S2 phone but today I can not change the wallpaper of the machine. I do not know why, but I turned off the power but did not. Anyone who has met this condition can I consult? All functions of the machine is still good, just do not change the wallpaper on the phone. I am very anxious to help everyone.

Thank you!
 
MERGED QUESTION
Question from ecom.vulinh1 : "Wallpaper application or android"