Various embodiments are directed to techniques managing telephone numbers and other telecommunication identifiers when placing and receiving calls or messages from a single device. In some embodiments, one of a plurality of outbound telephone numbers or other identifiers associated with the device or an application executing on the device may be selected when making an outbound telephone call or sending a message. In another embodiment, an outbound telephone number or other identifier is automatically selected when making an outbound telephone call or sending a message based on an association of that outbound telephone number with the intended recipient of the call or message.