How To Disable Siri, Passbook From The Lock Screen
One of the few things you can do from the lock screen in iOS is use Siri, which means that you can use it to make a phone call, FaceTime call, send a text message to anyone on your Contact list, send tweets and Facebook posts from your account or even send an email etc.
We find it very convenient, but if you’re paranoid about someone misusing the functionality when you leave your iPhone, iPad or iPod touch unattended or you lose your iOS device then you can always disable Siri from the Lock screen.
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