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SwiftKey does this. The main keyboard is QWERTY (with numbers obtained by long pressing on the top row) but there is a 123 button which switches the layout to a numeric keypad layout with the ten digits in a grid plus some punctuation to its right.

I really like SwiftKey. It has quickly become very good at guessing my next word so I can often write simple messages by picking a lot of the suggestions (often more than half for really simple things). It also has a fair few skins to changes its appearance. It isn't free but I think its only a couple of quid and it's worth it.
 
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