Apple has updated the system software for their iPhones and iPads. The new system software, iOS 7.1, is highly recommended for any devices that are already running any version of iOS 7. You can see what operating system your iPhone or iPad has by going to Settings > General > About and looking at the Version.
To update to iOS 7.1, go to Settings > General > Software Update
While users of iOS 6 may still prefer that system’s user interface, iOS 7 is starting to show a lot of promise in this current release. Additionally, our experience has been very positive with iOS 7.1 on older hardware, specifically iPad 2 and iPhone 4.