Thank you for reaching out to us. We can certainly assist you with your inquiry. I know the convenience of knowing when your message has been read. On the iPhone you are able to set up your device to send receipt to others when you have read their messages. This would be enabled by going to; Settings > Messages > Send SMS Reciept. They would have to enable that option on their end for you to be notified if they have read your message. So overall it is a mutual setting that must be enabled in order for the funtion to work as you are asking. Please let us know if we can be of any more assistance.
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