By default, the iPhone’s Messages app shows you the date and time for the first message on any given day, but not for every message sent and received. However, the exact time each message was sent is hidden — but there’s an easy way to show all the exact timestamps.
In the screenshot below, notice the date and time at the top of a group of messages. But, there are no times on the individual messages.
You might also see a Read message at the bottom of the latest message with a time (if it’s from the current day), a day of the week (if it’s from the last week), or a date (if it’s from before the last week).
Note: By default, when someone with an iOS device sends you a message, they know when you have read their message. They will see a Read message below the message you sent. However, you can prevent people from knowing you’ve read their messages when using iMessage in iOS.
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