tk2dCamera resolution for all mobile devices

[Desttro]

Hello,
please, can you give me advice? I'm going to develop 2D game with tk2dCamera for iOS, Android and Windows Phone.
I don't know which native resolution to use. I can see here: http://stats.unity3d.com/mobile/display.html that most devices are using 800 x 480.
But I want that my game will look awesome on iPhone 5 resolution 640 x 1136 with 4 inch display but also on older iPhones with 3,5 inch and resolution 640 x 960.

And also iPads with retina ...

And depends on this selected resolution or aspect in my gamewindow?

Thank you!