If you are using an Android device, follow these simple steps:
The interface is slightly different on iOS, but just as easy: unblock someone on whatsapp
If you blocked a random number that wasn't saved in your phonebook, you can still unblock them by going to the list in your Settings as described above. Their phone number will appear there even if they don't have a name attached. If you are using an Android device, follow
Click the contact you wish to unblock and confirm the action. Important Things to Know After Unblocking unblock someone on whatsapp
Open and tap the Settings gear icon in the bottom-right corner. Tap Privacy > Blocked .