Communication system

A method of populating a store with information identifying user devices capable of communicating in a communications network, the method comprising: establishing a communication event from an initiator device to a recipient device via the communication network using information identifying the recipient device; receiving from a user of the initiator device a selection signal indicating that said information identifying the recipient device is to populate the store; and transmitting said information identifying the recipient device from the initiator device to the store via the communication network.