The latest version of iOS is a minor revision that works on sorting out bugs- something that should be obvious given the very small increment in the version number. As per Apple, this update contains improvements and bug fixes, including:
- Improves reliability of using HDR option for photos taken using the Lock Screen shortcut
- Addresses bugs that could prevent the new iPad from switching between 2G and 3G networks
- Fixes bugs that affected AirPlay video playback in some circumstances
- Improved reliability for syncing Safari bookmarks and Reading List
- Fixes an issue where ‘Unable to purchase’ alert could be displayed after successful purchase
For information on the security content of this update, please visit this website
Available for your iPhone 3GS, 4 and 4S as well all models of the iPad and the third and fourth generation iPods, the latest build 9B206 can be downloaded directly as an OTA to your device or through iTunes.