When you block people on WhatsApp, you will no longer receive WhatsApp messages, calls or status updates from them.
In more detail, here is what happens when you block someone
- WhatsApp messages and status updates sent by a blocked contact will not show up on your phone and will never be delivered to you. Learn how to block/unblock a contact on: Android | iPhone | Windows Phone | Nokia S40 | BlackBerry | BlackBerry 10
- Your last seen and online information will no longer be visible to contacts you have blocked. More details about last seen and online can be found here.
- Your status updates will not be visible to any blocked contacts. Learn more about the status feature on: Android | iPhone | Windows Phone
- Any changes made to your profile photo will no longer be visible to contacts you have blocked.
- You will not be able to call, send messages or status updates to blocked contacts until you unblock them.
However, there is one important feature blocking does not change
- Blocking someone will not remove this contact from your WhatsApp list, nor will it remove you from the list on this contact's phone. To delete a contact in WhatsApp, you must delete the contact from your phone's address book.
If you unblock a contact, you will not receive any calls or messages that person sent you during the time they were blocked.
If you are concerned whether a blocked contact will know if you are blocking them, please see this article.