Some users on twitter observed that you are able to use Siri, even if your phone is locked and passcode protected. You can simply hold down the home button to get access to Siri and then send an email, text message or call someone.
So how can you prevent someone from using Siri on your locked iPhone? Well, the solution is very simple. You have to disable “Allow access to Siri when locked with a passcode in the Settings (Settings -> General -> Passcode Lock). Once you’ve done that, you first have to enter your passcode to access Siri.
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