Is messaging iPhone to iPhone unlimited?

So I was telling a friend of mine who has an iPhone that I'm either getting an iPhone from my cousin tomorrow or when I can afford to buy one myself and he mentioned that when I got one he could text my phone all the time. So I asked him what the difference between then an now would be as I would just be switching phones. I wouldn't be adding data or anything and he said texting iPhone to iPhone is unlimited. Is this true?

Correct, just go into your settings icon and turn imessage on.

Yes I have a Iphone 4s and what he is talking about is a feature called IMessage it only works when both Iphones are connected to Wi-Fi Imessage is on Ipod/Ipad to. You can also do Facetime http://www.apple.com/...d0735272d1
You can take screen snap shots by pushing and releasing the Home button and the power button at the same time

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