Because of the variety in mobile operating systems for smart phones, apps that target more than one platform are truly "in" today, so you as the developer need to find the best way to develop cross-platform apps, without emptying up all your resources on developing for just a couple of platforms at one time. Fortunately there are some really great multi-platform developer tools, using which you can easily achieve your aim. One of the earlier attempts, which I examined in this work, was from Adobe and targets on iPhone. Apps are first created as Flash applications and then converted to native iPhone apps.