Late Tuesday, Apple released version 3.1.3 of its iPhone OS firmware. The update, which weighs in at over 200 megabytes and can be downloaded by attaching your iPhone or iPod touch to your Mac or PC, clicking the device in iTunes, then clicking the “Check for Update” button, adds the following fixes and changes:

- Improves accuracy of reported battery level on iPhone 3GS.
- Resolves issue where third-party apps would not launch in some instances.
- Fixes bug that may cause an app to crash when using the Japanese Kana keyboard.
- Full list of security updates listed here.

If you’ve installed iPhone OS 3.1.3 and noticed any changes, please let us know.