Integrate Admob in iOS and windows phone

I am a Unity dev and have many live games at android store. I want to port my all games for App store and windows phone and make them live for free. And want to generate some revenue using Google Admob. Unfortunately i am working on it for 2 weeks and tried many plugins from assets store but not a single one worked.

Please help me to integrate Admob in my games for App Store and Windows phone. I am using Unity 4.3.4 Mac OS Pro. Your help is highly appreciated.