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My old phone Motorola Defy had the option by calling to search for a contact just typing a number. Not sure how that feature is called but I'll give an example:
If I want to call "Alex" i need to press 2(a bc) 5(jk l) 3(d e f) 9(w x yz) and I press the call button.
Now I got the Nexus 4 and there is not such a feature, which is really annoying. Is there a custom dialer that support this feature? Or is it possible to enable it from somewhere?