Will the person I block on WhatsApp know - briefly?
When you block someone on WhatsApp, they will not be notified that they have been blocked. However, there are some indicators that might suggest to the blocked person that something has changed, such as the inability to see your profile picture or status updates.
Will the person I block on WhatsApp know - in detail?
When you block someone on WhatsApp, the user you have blocked will not be immediately informed of your action through a notification or alert. However, there are several signs that might indicate to them that they have been blocked.
Firstly, the person you have blocked will no longer see your profile picture, status updates, or any changes you make to these features. This can serve as an indirect clue that their access to your information has been restricted. Additionally, messages sent to you by this user will remain with a single gray checkmark, indicating that they were not delivered. They will not receive read receipts (double blue checkmarks) or the "Last Seen" timestamp for your activity.
Another noticeable change is that calls from the blocked individual will not go through; instead of ringing, their calls will immediately go to voicemail. This can also hint at the possibility of being blocked. However, it's important to note that WhatsApp does not send a direct notification or confirmation to users who have been blocked.
In summary, while there is no explicit notification sent to the blocked user, certain changes in their interaction with your profile and messages can suggest that they have been blocked on WhatsApp.