Apple today released iPhone OS 3.1.3 for all iPhone and iPod touch models, addressing several specific bugs as well as offering fixes for a handful of security issues.

This update for the iPhone and iPod touch contains bug fixes and improvements, including the following:

- 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.

This update can be downloaded from iTunes .