This is a wasted vote. SMS simply doesn't have this functionality. The only way this could be implemented would be if the message read status was sent separately via the internet to a 3rd party textra server. The recipient of the message would obviously need to be running textra.
But if you were doing that why not just send the message via the internet too? Well because then you'd just have another WhatsApp clone and not an SMS app...
This is a wasted vote. SMS simply doesn't have this functionality. The only way this could be implemented would be if the message read status was sent separately via the internet to a 3rd party textra server. The recipient of the message would obviously need to be running textra.
But if you were doing that why not just send the message via the internet too? Well because then you'd just have another WhatsApp clone and not an SMS app...