Phone infected with ads?
Everytime I open an app the top notification bar turns black and the screen is unresponsible until I press the "back" button and a few seconds later it displays an ad I have to close manually.
I tested other phones and it only happens with my phone when I open whatsapp or games like clash of clans and pokemon go.
I have downloaded Apk files before instead of using google play, maybe thats the problem?
What do I do?
Yes
Factory wipe phone or try to find the culprit in the settings > apps section
>>176533
Wont factory wipe erase everything on my phone?
How do I back-up my files?
>>176537
google drive, computer, etc