Is QT available for android and iphone platforms?
There is experimental Qt support for Android.
http://sourceforge.net/p/necessitas/home/necessitas/
See this question for iPhone.Qt for iPhone/iPad?
You can publish for iOs, Android and even others from a single code base with V-Play (v-play.net). It's a cross platform game engine based on Qt/QML with many useful V-Play QML game components for handling multiple display resolutions & aspect ratios, animations, particles, physics, path finding and more. API reference.
(Disclaimer: I'm one of the guys behind V-Play)