Quoting what’s in the first release:
> At launch, Lockdown Mode includes the following protections:
> Messages: Most message attachment types other than images are blocked. Some features, like link previews, are disabled.
> Web browsing: Certain complex web technologies, like just-in-time (JIT) JavaScript compilation, are disabled unless the user excludes a trusted site from Lockdown Mode.
> Apple services: Incoming invitations and service requests, including FaceTime calls, are blocked if the user has not previously sent the initiator a call or request.
> Wired connections with a computer or accessory are blocked when iPhone is locked.
> Configuration profiles cannot be installed, and the device cannot enroll into mobile device management (MDM), while Lockdown Mode is turned on.
I’m not a target (I think, and hopefully don’t get to be one), but nevertheless I’d feel safer with this turned on (I very rarely use FaceTime, so not accepting it is not a big deal).
I’d also love more protections. Not allowing specific apps to connect to any network (WiFi included), Apple handling issue reports on apps with urgency (right now they seem to be ignored even when policy violations which are against the user’s interests are reported), etc.