iOS 9.3 is coming in the Spring and will introduce Night Shift as well as a number of other new features.
Apple Releases iPhone OS 3.1.2 [Updated]
This update contains bug fixes and improvements, including the following:
- Resolves sporadic issue that may cause iPhone to not wake from sleep
- Resolves intermittent issue that may interrupt cellular network services until restart
- Fixes bug that could cause occasional crash during video streaming
Update: A corresponding update is also available for the iPod touch.
Also, the iPhone OS 3.1.2 update for iPhone in U.S. is accompanied by an update to AT&T's carrier settings file, which brings the settings to version 5.6.