Apple has released a new software update for the iPhone and iPad, the update comes in the for of iOS 9.2.1 and it is a minor update.
The iOS 9.2.1 software update is a small update of less than 40MB, depending on device and it comes with a range of bug fixes and security improvements.
The update is available for the iPhone 4S and above, the 5th generation iPod Touch and the iPad 2 and above.
You can check to see if the iOS 9.2.1 software update is available for your iPhone or iPad by going to Settings > General > Software Update.
Source Apple