A system and method for providing data files, such as ringtones, screensavers, games, and other types of application software, to a mobile telephone, such as a cellular telephone, is disclosed. An illustrative system is internet-based and provides subscribers with access via a general purpose computer to a large number of data files that are selectable by subscribers for storing in respective user-specific data lockers that are established by the system. Users may access their user-specific data lockers via a URL link that is sent to their mobile phones by the system as a text message.