Apple released an update for the iPhone and iPod touch. iPhone OS 3.1.3 update improves accuracy of reported battery level on the iPhone 3GS, resolves an issue with some apps that don’t launch and fixes a bug with Japanese keyboard.
The Mac Observer mentions that iPhone OS 3.1.3 includes some security fixes as well. So make sure to install this update as soon as possible.
You can install the update using iTunes. Remember if you have jailbroken the device then you need to wait until the new jailbreak is out.
Arabic version of this post on SaudiMac.net.