Lockdown Mode is an optional, extreme protection feature available on iPhone, designed for individuals who might be personally targeted by sophisticated digital threats. When enabled, Lockdown Mode restricts certain apps, websites, and features to reduce the attack surface that could be exploited by highly targeted spyware. It is available in iOS 16 or later and can be turned on in the Settings app under Privacy & Security. This feature is recommended for individuals who believe they may be targeted by highly sophisticated cyberattacks, and it is important for complete protection that all of the user's devices have Lockdown Mode turned on