Not all applications are available to all phones. The desired application may not be available for your device, depending on factors like your OS version, Your screen resolution or the country from which You are accessing the Windows Phone 7 Marketplace.
Open your preferred Barcode scanner software (or download one here)
Point your phone camera at the QR code below and scan it.
Follow the onscreen instructions to proceed with the installation.
Explore freeware Windows Phone 7 apps for your HTC, Samsung, LG or Nokia WP7 phone. Download games, social apps and tools for your HD7, Mozart, Trophy, Omnia 7, Focus, Quantum, Optimus, Nokia Lumia 710 and Lumia 800 windows 7 phones.