Follow the instructions below for your particular phone to block calls from unknown callers.
To block unknown callers with an iPhone if it’s running iOS 13:
1 – Tap Settings.
2 – Tap Phone.
3 – Scroll down and toggle the Silence Unknown Callers setting to On.
To block unknown callers with an iPhone if it’s running iOS 12 or earlier:
1 – Tap Settings.
2 – Tap Do Not Disturb.
3 – Tap the slider switch beside the“Manual” setting to enable it.
4 – Tap Allow Calls From.
5 – Select All Contacts.
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