Change the iPhone keyboard?

So, I have the iPhone. But, I absolutly hate the keyboard! I want to change it into the razor keyboard where you have to press the number 2 key three times to get to the letter c. Don't ask why, just help me out.
:):)thankss
Update: thanks.. i guess its not yet possible... i searched for it in the app store. i love my phone the keyboard just sucks ***.
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