As you might know that Siri and Passbook will work on your lock screen, even while the iPhone is passcode protected. These functionalities are set to work by default on a locked iPhone. But sometimes it might be unsafe. If you wish to protect Siri and Passbook with a passcode, then here’s how you can do that,
Step 1: Access the Settings app
Step 2: Tap General
Step 3: Tap Passcode Lock and type the passcode when prompted.
Step 4: Scroll down to “Allow Access When Locked” section and turn Off Siri and Passbook options.
That’s it! Hereafter the phone will ask you to enter the passcode before accessing Siri or Passbook from the lock screen.
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