Of all the announced new features of the Nexus 5 and Android 4.4/KitKat, one of the cooler ones was a new dialer colloquially known as the "KitKat dialer." It features a revamped UI and includes the ability to search for businesses, contacts, etc. right from inside the dialer. It also features Internet-based caller ID. The name "KitKat dialer," however, is not entirely accurate.
Background
Google Dialer (its official name) is not technically part of KitKat because it is not included in AOSP.
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