Why do I get a popup every time I unlock my phone

[AC Question]

Every time I unlock phone and occasionally when I'm idling on it I white page pops up with a green loading bar at the top that brings me to the Google play store, I looked into it and it's source is an unnamed app that I can't force stop or delete, how did it get there and how do I get rid of it (besides a factory reset)

 

[belodion]

See this: [Guide] Malware / Adware / Popup Removal

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