One of the most annoying things about messaging on iOS is the lack of true time stamps for messages. It felt as if iOS would randomly place a time stamp throughout a conversation, but there was no obvious pattern. Because the time stamp was so random, it was very difficult to go back and view when a message was sent or received mid-conversation.
Someone at Apple finally was able to convince the powers that be to time-stamp every message in the Messages app. Can I get a "Huzzah!"?
To view a time stamp for a message, open the Messages app and select an existing conversation. You'll notice the random time stamp is still present, but if you tap and hold anywhere within the conversation bubbles and swipe to the left, the exact time of every message in the conversation is revealed. Magic!
A simple time stamp is far from a groundbreaking feature, but it's one that was long overdue for iOS. And yes, it's really sad that it took until iOS 7 for it to be integrated.