RPG fans with smartphones have lots of options today. In addition to Final Fantasy Agito, Sega just released Phantasy Star Online 2es on iOS. The mobile version is also on Android and has been available for a couple of months.
Just a heads up that iAC purchased in Phantasy Star Online 2es for iOS cannot be used with the PC, PlayStation Vita or Android versions. Phantasy Star Online 2es is compatible with iPhone 4S and up, iPad (3rd Gen) and up, and iPad mini.