This isn’t true. The iPhone is locked down over iCloud. I assume remote lockdown also works while the phone is turned off or on airplane mode (as Find My Phone does by using the passive Apple mesh network)
>I assume remote lockdown also works while the phone is turned off or on airplane mode (as Find My Phone does by using the passive Apple mesh network)
It doesn't need to be. If you have a passcode, the phone can't be used unless the correct passcode is entered. If you try to factory reset it, you can't get past the setup wizard if find my iphone was enabled for the phone prior to the wipe. Note this doesn't require that the phone receive notification that the phone has been marked stolen. So the only way you can use the phone is if find my iphone wasn't set up prior to it being lost.
