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Getting Siri to actually do what you want it by standing close by and shouting tends not to work - not sure how some ultrasonic whisper is going to get the job done.

At least with Alexa devices disabling alarm systems and unlocking doors requires a PIN, mostly to defend against the much more low tech attack of shouting through the victim's letter box.

For six months Siri interpreted my requests to call anyone as "Call Paul." It still might, but at that point I gave up and changed Paul's name in Contacts to stop accidentally bothering the poor guy.