Apple provides several ways to view and edit your list of blocked contacts. The location of this list has evolved with recent software updates.
From the Blocked Contacts screen, tap Add New to select a person from your contact list or manually enter a phone number or email address .
Alternatively, you can tap in the top-right corner of the Blocked Contacts screen, tap the red minus sign (-) next to the name, and confirm by tapping Unblock.
Note: Blocking a contact does not prevent them from contacting you via third-party apps like WhatsApp, Instagram, or Facebook. You must block them within those specific apps separately.
If you accidentally blocked the wrong person or want to reinstate communication, the process is simple.