Turn off personalized ads in your Google account
Reset your advertising ID
Disable pop-up notifications from apps
Uninstall suspicious or ad-heavy apps
Check app permissions and remove unnecessary ones
Use a browser with built-in ad blocking
Enable ad blocking in your browser settings
Turn off notifications from websites in your browser
Scan your phone for malware
Keep your phone and apps updated
Use a private DNS or ad-blocking DNS
Avoid installing apps from unknown sources
Factory reset your phone if ads keep appearing