In one-on-one chat, you see single checkmark and double checkmark next to each message you send.
Single Checkmark indicates that your message has been sent from your device to the server.
Double Checkmark indicates that your message has been delivered to the recipient’s device. However, it does not necessarily mean that the recipient has read the message. We don’t provide message read status due to privacy concerns. In group chat, you only see single checkmark for your messages. We don’t show message delivery status for each recipient in a group chat.