Turn on airplane mode
Disconnect from Wi-Fi and Bluetooth
Restart the phone in safe mode
Delete suspicious apps
Remove apps you do not recognize
Clear browser data and cache
Uninstall recently installed apps
Check app permissions and revoke suspicious ones
Update the operating system
Update all apps
Run a trusted mobile security scan
Change passwords for important accounts
Enable two-factor authentication
Back up important data
Factory reset the phone if problems continue
Restore only essential data after reset
Avoid sideloading apps from unknown sources
Keep the phone and apps updated regularly