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This question already has an answer here:

I have a Samsung Note 8. I took my phone to the store yesterday, and now I have a second lock screen with ads. I have gone through all of my apps that I dont regularly use, and have tried cleaning up junk files off of my phone, but nothing has worked. Does anyone know a way to get rid of this screen?

marked as duplicate by Firelord Mar 31 at 20:56

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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That lock screen (the one with ads) is usually from a cleaner app like clean master, 360, baidu etc there should be an On and Off switch inside the app or you can just uninstall the app If you couldn't find it tell me the name of the app i tell you where it is

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