Will the subscriber know if I block them in WhatsApp - briefly?
No, the subscriber will not be notified if you block them on WhatsApp. They may suspect it if they can no longer see your last seen or online status and their messages are not delivered.
Will the subscriber know if I block them in WhatsApp - in detail?
When you block a contact on WhatsApp, there are several indicators that can alert the blocked user to your action. Here's a detailed breakdown of what the other person might notice:
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Undelivered Messages: If the blocked user tries to send you a message after being blocked, they will see only one checkmark (indicating the message was sent but not delivered). This is unlike regular messages where two checkmarks indicate delivery and a filled circle shows the message has been read.
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No Profile Picture or Status Update: The blocked user won't be able to see your profile picture, status updates, or any changes you make to your profile. If they try to view your profile, it will appear as if no information is available.
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Calls Will Not Go Through: If the blocked user tries to call you on WhatsApp, the call will not go through. They might see a message saying that the call did not connect or it may ring indefinitely without connecting.
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No Group Interaction: If both of you are part of the same group, the blocked user won't be able to see your messages within the group. Additionally, they won't receive any notifications about changes in your status or profile picture within the group.
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Your Last Seen and Online Status Won't Update: The blocked user will no longer see your last seen or online status. This can be a significant clue if you were previously active on WhatsApp and they frequently checked your status.
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No Notifications for Message Delivery: If the blocked user was previously able to see read receipts (blue checkmarks), these will no longer appear for messages sent to you after you've blocked them.
While WhatsApp does not send a direct notification or alert informing someone that they have been blocked, the above indicators can strongly suggest that their messages are not being received and that there has been a change in communication status.
In summary, while blocking a contact on WhatsApp doesn't send an explicit notification, the various changes in message delivery, profile visibility, call connectivity, group interaction, and status updates can make it evident to the blocked user that something has changed.