A pop-up appeared on my phone stating:


You only have to install a Great App to get your phone fully functioned.

The only option I am given is "Confirm."I accidentally hit the confirm button and another popup appeared stating that the install was blocked. It appears that the initial pop up is powered by the "Yellow Booster" app. I tried restarting my phone but it reappeared again.

How do I avoid this, as it seems very suspicious to me.

suspicious app

yellow booster

  • 1
    Give us a relevant screenshot. This popup, when does it appear? when using a browser?
    – Firelord
    May 30, 2016 at 16:47
  • I was using my broswer the first time, the second I was trying to scan for malware, which can be seen in the screenshot.
    – user168160
    May 30, 2016 at 16:55
  • 2
    As you have guessed, don't let them install the app for now (i.e. don't enable 'allow unknown source').
    – Andrew T.
    May 30, 2016 at 17:10
  • On a (un)related note, what is the app on the background that says 'Full Scan'? Does the popup always appear when you access it?
    – Andrew T.
    May 30, 2016 at 17:11
  • 1
    My answer may help: Apps trying to install in background
    – Firelord
    May 31, 2016 at 8:53


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