A mobile computer system requests data by requesting the establishment of a voice connection to a voice server, such as, for example, by selecting a telephone number. The mobile computer system provides an identifier (e.g. caller identification information) that identifies the mobile computer system and a called number that represents data of interest to the mobile computer system. After receiving the identifier and the called number, the voice server may deny the request for establishment of the voice connection. The voice server identifies the data of interest, which may be stored at the voice server or at a data server associated with the voice server, based on the called number. The identifier is mapped to a data address associated with the mobile computer system and the data of interest is sent to the data address. The mobile computer system receives the data of interest over a data connection.