How do I unblock a contact on iPhone?

Hello!

1. Go to Settings  > Apps > Phone.
2. Tap Blocked Contacts, then tap Edit.
3. Tap , then tap Unblock.

From: Block or avoid unwanted calls on iPhone - Apple Support

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"How do I unblock a contact on iPhone?: Help me to unblock one of my contacts I tried the steps and can’t do it"

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Unblocking a Contact:

A: Remove from Filters:

Are you using a third-party security app to filter phone calls? If so, remove it form the block, and add it to a Safe List. As for the app, uninstall it.

B. Have Someone Else Unblock it:

Is this a company=owned device? If so, you may not be able to do this, due to Screen Time restrictions.