Turn on Google Play Protect
Remove suspicious or recently installed apps
Uninstall apps with “Display over other apps” permission
Disable notifications for unwanted apps
Turn off pop-ups and redirects in your browser
Clear browser data and site permissions
Use a reputable ad blocker or private DNS
Check app permissions for overlays, notifications, and accessibility access
Update Android, apps, and browser
Scan for malware with a trusted security app
Reset app preferences if needed
Factory reset the phone if ads continue after cleanup