How to text any number using iMessages on iPhone?

I have an iPhone 5. I like how iMessages sends texts without the use of SMS, but rather data. It also uses your real phone number (to save the hassle of giving people two phone numbers vs.a 3rd party texting app) But it only does it to other iPhone users. Does anyone know how I can use iMessages to send texts to non-iPhone users?

Or another app that sends texts through data, but also uses your real phone number.

Imessage is great, you can even use messaging from ipads and do so without a contract. Its only for iphone, ipad, ipod touch etc, sending to other phones would send as regular SMS text.

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