The Korean electronics giant said availability of KitKat varies by carrier and product, but updates will begin Tuesday and will continue through the coming months. The
New features of that operating system include a redesigned dialer that allows users to search for any number, even if it's not in their phone books. For example, users can start typing the name of a restaurant and see the number appear in their list. In addition, search results or queries now pull data from apps as well as the Web. A search for a restaurant, for example, could include an app in the search results.
Here's the full list of Samsung devices scheduled to receive KitKat: