If you choose to block someone, they will no longer be able to see your profile. They will also be unable to send messages, call, or invite you to join groups. If you are in the same group, you won’t see each other’s messages. The contact won’t get a notification about the block. The contact will be deleted from the Signal contact list and you won’t get notifications from them. If you block a group, you automatically leave the group. Members won’t see your name and picture. You can’t get any notifications and can’t be re-added to the group. If someone has blocked you and you. Send them a message, the person simply won’t get it. The messages don’t get sent once the person unblocks you. After you unblock a user, you can get notifications from them again, but only about new messages and calls.