Clone of whatsapp or line with a twist.

I need an app very similar to whatsapp or Line but it will contain a twist. It should be written in native code and I will need for three platforms iOS, Android and Windows phone. Please give me a price for writing the app for all three platforms using native code and a price for making a HTML5 app. And to make sure you're paying attention and not bid spamming, post the following in your bid. "I read and understood your project".