Hacked I think

Jul 11, 2018
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My wife phone and my phone show that they are messaging each other but we are not messaging each other. Every now and then my wife says that she sees a message pop u on her screen and then disappears. We have cancelled Facebook and all security doesn’t show any faults and our phones are not linked. What can I do to stop this?
 
antivirus can´t find anything unnormal?

Maybe it´s advertisment

If not and it´s infected, I would factory reset the phones and start from the bottom. Backup your phones before doing so. Scan the files you backuped with a PC antivirus software like "malwarebytes"