Microsoft has unveiled Windows Phone 8, the latest version of its smartphone software.
Windows Phone 8 will be built on the same core as the technology giant's new PC and tablet operating system.
The launch of the new platform is the latest attempt by Microsoft to challenge Apple's iPhone and Google's Android devices. It will succeed Windows Phone 7, Microsoft's current operating system.
Due to be released in October, Windows 8 is designed to run on tablets and traditonal PCs and is expected to give smartphone users a greater choice of apps and the ability to switch between devices.
It features touch-friendly 'Live Tiles', colourful squares representing people, apps or services.
The Windows Phone 8 platform will support two new screen resolutions as well as Near Field Communications technology, maps and GPS software, a wallet app and a total of 50 languages.
The Windows Phone 8 launch follows the unveiling of Microsoft's Surface tablet on Monday (18 June).