What's the best free texting app for the iPhone?

I'm looking for an iPhone application that will allow me to send text messages for free using any sort of connection, whether it's 2G, 3G, 4G, or Wi-Fi. I'd also like this app to let me text using my same number instead of giving me some other number, and I want to be able to text anyone, regardless of what phone they have, not just app to app. Does this sort of application exist? It would save me $240 per year if I could do this. If I have to use a different number to use this application, and if I canceled my texting plan, wouldn't I be charged if someone texted my old number by accident?

I think most people use BiteSMS i think it's called

luckily i don't have to worry about data plans (Grandfathered in)

Pinger Textfree with voice.
Its what I use, you can even text from your computer ^_^ you get your own number and you can pick one from your area code.

Nothing

Textfree with voice the app will give you a different number

Text plus is the best free texting app for the iphone. You have to be connected to the internet to use it.

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