iOS7 why won't the time show up in texts

ios messages

Swipe right to left to reveal the timestamps.

enter image description here

Related

Does Java come pre-installed on Mac OS X 10.7/10.8 and beyond?
Purchased music lost due to lack of space for iOS 7 update?
Outlook Mac 2011 regularly crashing
How can I get iTunes 11.1 to list songs by album and show cover art
How can I "go to page" in preview via toolbar?
Find My iPad setting prevents restore
Can I upgrade from Lion to Mavericks? Or must I upgrade to Mountain Lion, first?
Which versions of Adobe Creative Suite will work with Mavericks?
What is the EscrowService keychain item?
How do I power off my Mac with the Mavericks OS?
Unlock read-only USB key
How to debug slow terminal prompt?