How can I tell if someone has read my message for Windows Phone?

If you see two blue check marks next to your sent message, then the recipient has read your message. In a Group Chat or broadcast message, the check marks will turn blue when every participant has read your message.

Message info

For any message that you send, you will be able to see a message info screen, displaying the details of when your message was delivered, seen and played by the recipient(s).

To see the message info screen:

Open a chat with a contact or a group.
Tap and hold on your sent message.
Choose info from the menu.

The message info screen shows:

delivered when your message or media is delivered to your recipient's phone, but the recipient has not yet seen it.
seen or read when the recipient has seen your message or media. For a Voice Message, the recipient has seen but has not yet played it.
played when the recipient has played your Voice Message.

Note: when a participant is not a member of a group anymore, the message info screen will still show the original information with all participants, including the participant who no longer participates in the group.

If you do not see two blue check marks next to your sent message

The recipient may not have opened your conversation.
The recipient may be using an outdated version of WhatsApp.
You or the recipient may be experiencing connection issues.
You or the recipient may have disabled Read Receipts in their privacy settings.

Cheers,
WhatsApp Support Team