Do you use WIFI finder on Android?
https://threatpost.com/leaky_app_data/144029/ Do you use a wifi finnder app on your Android device? If so, your username and password may have been compromised. The above article identifies the apps which “leak” passwords.
ATT wireless Call Protect app
If you are an ATT wireless customer and are tired of annoying calls check out the “Call protect app”. https://www.att.com/features/security-apps.html?fbclid=IwAR0Ygsslxas-ADDGBjmoEc2mgibnAKLCIGE8AFWMmUS_JOzU93nN6wnZElM