The iPhone has revolutionized applications for mobile phones, allowing a vast array of applications that perform hundreds of different tasks to be easily downloaded and installed through the App Store, a native application on the iPhone, iPhone 3G and iPod touch. Using a WiFi, EDGE or 3G connection, users can purchase applications (some are free) from the App Store and download them directly to the phone. Apps can also be downloaded from the iTunes Store and synced with the iPhone/iPod once the device is synced with iTunes. The App Store was developed by Apple to interface with the AT&T cellular network. T-Mobile is also developing their own version of the App Store, most likely to interface with their newest smart phone, the T-Mobile G1, the first phone built running the new Google Android cellular firmware, which was likely built as a competitor for the iPhone