Abstract: Described is a technology by which a user's telephone-related data is aggregated from various sources for use in assisting the user with making telephone calls. For example, call history data corresponding to a landline telephone, a mobile telephone and/or an office telephone of the user may be combined. Other sources include a landline telephone service, a mobile telephone service, an enterprise telephone system or server, a computing device, voice mail data, web page data, electronic message content, instant message content, a contacts list, and/or an information data store. The telephone-related data can be processed (e.g., based on frequency and calling patterns) to determine corresponding probability data to help determine a user's intent in locating a particular recipient to call. The user may access the telephone-related data via voice commands input at one of the user's telephones, or by receiving a visible list of at least part of the telephone-related data.