A method of facilitating telecommunication functionality on a mobile device. The method includes receiving a request for a telecommunications transaction from the mobile device and retrieving a callback identifier for a user of the mobile device. The method also includes executing the telecommunications transaction, wherein executing the transaction includes establishing a communications session that includes a callback telephony endpoint represented by the callback identifier and at least one target telephony endpoint, wherein a portion of the communications session that includes the callback telephony endpoint is established at least in part by making an outbound call from a telephony switch.