Blocking on social platforms is distinct from blocking on your cellular network. Unblocking a number on your phone does not automatically unblock them on WhatsApp.
It is vital to understand that unblocking a number unblock phone numbers
On both iPhone and Android, you can unblock multiple numbers at once by editing the block list (tap or Select on the blocked numbers screen). That saves time if you’re cleaning up a long list. Blocking on social platforms is distinct from blocking