Apple has just released iPhone OS 3.1.3 Software Update, which includes a number of bug fixes and security patches for all iPhone and iPod touch models. The new version appears to be a very minor update, as the previous software version was 3.1.2. However, the update is recommended for all users (except those who jailbreak), as it includes the following fixes:
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
As usual, the update can be downloaded and applied in iTunes by clicking the “Check for Update” button under the iPhone Summary tab.

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