Mobile communication having mobile subscribers, PCN network, PBX and a local exchange

Claim 1

A mobile communications network having mobile subscribers and including a PCN (Personal Communications Network) network, a PABX (Private Automatic Branch Exchange) network coupled to the PCN network, and a local exchange whereby the PCN network and the PABX network are interfaced with a public (PSTN) network, a plurality of said mobile subscribers being normally associated with the PABX network, the PCN network including a base-station transceiver station (BTS), a base station controller (BSC) coupled to the BTS, and a mobile-services switching centre (MSC) coupled to the BSC, wherein there is a direct link between the PABX network and the BSC, wherein the PABX network has a respective jurisdiction associated therewith, wherein there is a further direct link between the BSC and the local exchange for effecting local calls, wherein calls involving mobile subscribers normally associated with the PABX network are routed via the BSC of the PCN network irrespective of whether the mobile subscribers normally associated with the PABX network are located within or outside the jurisdiction of the PABX network, whereby the mobile subscribers normally associated with the PABX network are able to be involved in calls when located within or outside the jurisdiction of the PABX network, wherein radio proximity is used to associate a mobile subscriber to a said network, wherein the network association of both the originating subscriber and the destination subscriber of a call are used to select a network for routing purposes, and wherein the mobile subscribers are able to subscribe to a plurality of services and those services vary automatically in dependence on where said mobile subscribers are located.