Most message attachments are blocked, and some features will not be unavailable. Incoming FaceTime calls from people you have not previously called will be blocked. Some web technologies and browsing features will be blocked. Shared albums will be removed from Photos, and new invitations will be blocked. Wired connections with another device while your iPhone is locked will be blocked. Incoming invitations from people you have not previously invited will be blocked. Configuration profiles - such as profiles for school or work - cannot be installed.
Open Settings. Navigate to Privacy and Security. Select Lockdown Mode. Select Turn On Lockdown Mode Your device will then restart to enable Lockdown Mode.