Virus, Worms or Malware??? How to remove pop up screen asking to install Apps?

Viruses and worms
1

Hi all, need help!

I just acquired a LG G4 mobile phone. It was all right until I do not know which app I installed that comes with a virus, worm or Malware, it kept popping up some advert to ask me to install Apps like Game War, Clash of Clans or enter a Competition…

It usually happens when I want to access my phone…ie. when I flip open my phone case the ad will appears. I have Avast Mobile Security Premium Suites installed. TrustGo Ad Detector installed. I run it many times, but none detected this Ad thingy! Frustrated!!! >:( :frowning: :frowning: ??? ???

Anyone can help and advise? Most appreciated.

2

resett phone to factory specc

3

Thank you.

Will try.