Apple® iPhone® - Turn Silence Unknown Callers On / Off

Note Notes:

  • Calls from unknown numbers are silenced, sent to voicemail and displayed on the 'Recents' list.
  • Phone numbers that call and have been previously texted or shared an email including the phone number are not silenced.
  • This setting isn't available for the iPhone 4 / 4s and the iPhone 5 / 5c / 5s.


  1. From a Home screen, tap Settings Settings icon > Phone.
  2. Tap the Silence Unknown Callers switch on On switch or off Off switch.


Note For additional ways to detect and block spam calls, check out this Apple Support page.