Find out how to block or unblock calls from your device.
In this tutorial, you will learn how to:
• Block or unblock recent callers
• Manage blocked numbers through Settings
You cannot block an Unknown Caller (No Caller ID), but you can turn on Do Not Disturb manually and set it to "Only allow calls from your contacts list." The call blocking feature may not affect phone calls made or received via third-party apps installed on your device. Please contact third-party app developers for assistance with such applications.
Learn more from the Apple support articles: Block calls and block or filter messages on your iPhone and Use Do Not Disturb on your iPhone.
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