Before you start scrambling for your phone, laptop and data cable, just relax for a second. The latest update to the iPhone software, version 3.1.3, is a minor one. A quick glance at the changelog shows that the update will improve accuracy on the reported battery level on the 3GS, which is a huge help because we’ve sometimes seen it go from 20% to dead in just seconds. The launching of third-party apps should no longer lead to any weird crashes and the Japanese Kana keyboard is fixed. Happy downloading!