Ever noticed that when you receive a call on the iPhone and it’s on, you get two options for dealing with the call—Answer or Decline—but if the phone is off, all you get is the slide to answer notice at the bottom? Believe it or not, you actually still have multiple options available to you.
By tapping the volume or sleep/wake buttons, you can silence the ringer with ease.
But if that’s not enough, simply tap the sleep/wake button twice in succession and it will have the same effect as tapping the Decline button, sending the caller directly to your voicemail system.
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