Mobile communications systems, methods and terminals for handling group calls related informations

A wireless communication system includes a system Infrastructure (110), a plurality of mobile stations (112,114) and a control terminal (170) operable to send to the mobile stations via the system infrastructure instruction signals by wireless communication relating to information the mobile stations are to store regarding wireless communications with other mobile stations in the system, wherein the information includes group membership information or data relating to communication groups of which the mobile stations are to be members and the instruction signals include an instruction relating to an order in which the group membership information or data in one or more lists of such information is to be stored by the mobile stations.