GamePhone - Free voice calls and text chat for Game Center

GamePhone gives you free voice calls and text chat with your Game Center friends!
Works on iPod touch, iPad, and iPhone* to call and chat with your friends for free, anywhere in the world.There are no limits for minutes, and no fees for calls.Turn your iPad or iPod touch into a phone!
* iPad and iPod touch work as a speaker phone unless you have a headset & microphone attached.
* When using a 3G or Edge cellular connection, only text chat is supported.
* Requires Game Center (iPhone & iPod touch with iOS 4.1 and higher; iPad with iOS 4.2 and higher.)
* Upgrade within the app for up to 4 person conference calls too!