You can not block an Unknown Caller (No Caller ID), yet you can turn on carry out Not harass manually and set it to "Only permit calls from her contacts list." The contact blocking function may not impact phone calls make or received via third-party apps mounted on your device. Please call third-party app developers for assistance with together applications.

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Learn an ext from the Apple assistance articles: Block calls and also block or filter messages on your iPhone and Use perform Not annoy on her iPhone.

Block or unblock current callers


From the home screen, choose the 
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 Phone app.BLOCK A CALLER: choose the Recents tab then choose the Info icon next come the call or phone number you want to block. 
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Scroll to and select Block this Caller, then pick Block contact to confirm. 
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UNBLOCK A CALLER: indigenous the desired contact screen, role to and select Unblock this Caller.
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Manage clogged numbers through Settings


VIEW clogged NUMBERS: From the residence screen, select the 
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 Settings App > scroll to and also select Phone > Blocked Contacts.
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BLOCK A CONTACT: From the blocked screen, pick Add New... then choose the wanted contact that you would prefer to block.
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UNBLOCK A CONTACT: Select Edit. Select the 
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Remove icon alongside the desired contact then select Unblock to confirm. When finished, select Done.
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Additional support


Apple
Visit your device manufacturer's website.


Apple community
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User manual
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