If you still have an existing chat history with the blocked contact, you can unblock them directly from the chat.
Click the icon (three dots or down arrow) above your chat list and select Settings . Click Privacy and then Blocked contacts .
To unblock someone on WhatsApp, you can either navigate through your privacy settings to manage your entire list or unblock them directly from an existing chat window . Once unblocked, you and the contact will regain the ability to send messages, make calls, and view each other's status updates .
It is important to understand the consequences of unblocking to avoid confusion.
There are three primary methods to unblock a contact on Android.