Cross-Platform Mobile Gaming Network PlayPhone Formally Launches

San Jose, Califonia-based PlayPhone today announced the formal launch of its smartphone social gaming network, with three million users already signed up to the service. The platform has been up and running since last year, but PlayPhone has now fully launched the service, with more than 1,500 developers having downloaded the software development kit for the service. The company is looking to take on Gree's popular OpenFeint network, and hopes to create the largest mobile social network available, according to business website Venturebeat. The PlayPhone app currently runs on iOS, Android, Flash, Windows Phone 7 and HTML5 platforms, and allows players to compete in multiplayer games across different platforms. The platform comes with its own virtual currency called Playcredits, which can be bought and accessed via any platform. Ron Czerny, chief executive of PlayPhone, explained, "We think that is something that nobody else will be able to do. You're not limited to playing with friends who have the same operating system as you." The platform currently has just 15 games available to play -- however, the company is looking to add a game every day by the time January rolls around.