Apple's latest smartphone OS is now available for download today. iOS 7 can be downloaded through the settings on your iDevice or can be downloaded and installed via iTunes.
iOS 7 sticks to the basics of how iOS works and feels but now it has a much flatter, simpler and more colourful design. The design change is massive compared to previous iOS updates.
Apps in the App Store are currently being updated by developers to now fit the new iOS 7 style with much flatter designed apps. So you should see some of your favourite apps now have much simpler designs.