Check for sudden battery drain
Check for unusually high data usage
Check for frequent pop-ups or ads
Check for apps you did not install
Check for apps requesting unusual permissions
Check for overheating when idle
Check for slow performance or crashing
Check for browser redirects or changed homepage
Check for unknown charges or subscriptions
Check for messages or calls you did not send
Check for antivirus or security alerts
Run a scan with a trusted mobile security app
Review installed apps and uninstall suspicious ones
Update your phone’s operating system
Clear browser data and cache
Back up important data
Factory reset the phone if problems continue