Office Mobile for iPhone was released on June 14, 2013 in the United States. Support for 135 markets and 27 languages was rolled out over a few days. It requires iOS 8 or later. Although the app also works on iPad devices, excluding the first generation, it is designed for a small screen. Office Mobile was released for Android phones on July 31, 2013 in the United States. Support for 117 markets and 33 languages was added gradually over several weeks. It is supported on Android 4.0 and later.