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When you hold the home button on the power off screen of an iDevice on the lockscreen or Springboard, what is it supposed to do?

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If you continue to hold, you get Siri [iPhone 4S & up]; even from the power-down screen…

…otherwise, you trigger fingerprint security, which requires you to touch but not press the home button from the lock screen to unlock the device [iPhone 5S & up].

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