Do you use the BrainTest app on Android? It’s malware.
This sophisticated new malware has infected between 200,000 and 1 million users. Even after uninstalling the app, the malware can re-appear. It installs a root kit so it can download and execute any code or steal your log in credentials off your device.
If you downloaded this app in the last few months, please uninstall it.
If it reappears after uninstall, it means the malware has installed a persistency module. Your phone will need to be cleaned by installing a new ROM. Take your phone in to your local wireless service provider if you need help.