The invention relates to a method and an arrangement for concealing the true identity of a user in a communications system comprising a first user equipment having a first characteristic identifier, a second user equipment having a second characteristic identifier, a service network serving the first and the second user equipment. The method according to the invention comprises: requesting a virtual identifier by means of the first user equipment; establishing the virtual identifier for the first user equipment; linking the virtual identifier of the first user equipment to the first characteristic identifier of the first user equipment and using the virtual identifier of the first user equipment for communication between the first and the second user equipment.