If you are having trouble unblocking a contact on WhatsApp, there are a few things you can do. First, try using the phone’s contacts manager. This will list all of your contacts in alphabetical order and will allow you to select the one you want to unblock. Next, try using the phone’s search function. This will help you find the contact that is causing the problem. Finally, if all of these methods don’t work, you can try calling the contact and asking them to unblock themselves.