Check for unusual battery drain
Check for unexpected data usage
Look for apps you did not install
Review app permissions
Scan your phone with a trusted mobile security app
Update your operating system
Update all installed apps
Remove suspicious apps
Clear browser cache and history
Check for pop-ups or redirects in your browser
Restart the phone in safe mode and test for suspicious behavior
Verify unknown device administrator or accessibility access
Reset browser settings
Back up important data
Perform a factory reset if problems continue