I think I must have downloaded an app that's caused my phone to periodically throw up adverts. Most often when I use wattsapp, however sometimes they just popup when I put in my passcode. Full screen ads, some with sound, I have to find the little x to get rid & its getting annoying. Early research by me just keeps leading to: back up contacts and do a reset.... however, I would rather avoid that. Any I.T. people out there suggest a different solution? P.S. It's a Samsung 6 edge, about two years old.