Update iPhone to the latest iOS version
Open Settings
Tap General
Tap Software Update
Install any available update
Check for unknown apps on the Home Screen and in App Library
Delete any app you do not recognize
Open Settings
Tap General
Tap iPhone Storage
Review installed apps for anything suspicious
Open Settings
Tap Safari
Tap Clear History and Website Data
Open Settings
Tap Calendar
Remove unknown subscribed calendars
Open Settings
Tap General
Tap VPN & Device Management
Remove unknown profiles, MDM, or VPN entries
Open Settings
Tap Privacy & Security
Review app permissions for suspicious apps
Restart the iPhone
Change Apple ID password
Enable two-factor authentication for Apple ID
Review Apple ID devices in Settings
Remove any unfamiliar devices
Back up important data
Erase all content and settings if problems continue
Restore only from a trusted backup
Contact Apple Support if you still suspect malware