About iphone's delivered/read text messages [with screenshot! ]?

The text I last sent shows as "delivered." Does this mean it hasn't been read?
Or if the read receipts setting is turned off, would the top message still show as "read"?

"Delivered" means the message was delivered to the other person's iOS device. "Read" means that the person has opened the message, but that depends if the person has that setting turned on or not. That setting is mostly used on iPod Touches, as they do not have a constant internet connection. Hope this helps.

What are the reasons a message would not be read?

Show when a text message is read