A communications system comprising: a plurality of wireless communications local area networks; and a wireless communications wide area network, means to send and receive communications to mobile communications devices capable of operating in a first mode within one of a plurality of wireless communications local area networks and capable of operating in a second mode within said wireless communications wide area network, and capable of performing a network handover between at least one of said wireless communications local area networks and said wireless communications wide area network, the communications system comprising handover means to process a handover request received from such a mobile communications device when said mobile communications device seeks to perform a said network handover in either direction between said wireless communications wide area network and said at least one of said wireless communications local area networks; the handover means comprising means to identify a wireless communications local area network associated with the said handover request; means to determine an identity for a user of the mobile communications device making the handover request; means to communicate said identity to a router for said wireless communications local area network associated with said handover request; wherein the communications system is arranged to enable a first subscriber associated with said wireless communications local area network to store, at a location accessible to said router, for each of a plurality of mobile communications devices, a subscriber-personalised network handover alert to be announced on the mobile communications device associated with said user identity on entering and/or leaving an area covered by said wireless local area network, wherein the form of said subscriber-personalised network handover alert is selectively determined by said first subscriber, and means to determine, when a handover is requested, whether said subscriber-personalized network handover alert has been configured on said router for communication to said mobile communications device and if so, to communicate said alert to said mobile communications device a plurality of wireless communications local area networks; and a wireless communications wide area network, means to send and receive communications to mobile communications devices capable of operating in a first mode within one of a plurality of wireless communications local area networks and capable of operating in a second mode within said wireless communications wide area network, and capable of performing a network handover between at least one of said wireless communications local area networks and said wireless communications wide area network, the communications system comprising handover means to process a handover request received from such a mobile communications device when said mobile communications device seeks to perform a said network handover in either direction between said wireless communications wide area network and said at least one of said wireless communications local area networks; the handover means comprising means to identify a wireless communications local area network associated with the said handover request; means to determine an identity for a user of the mobile communications device making the handover request; means to communicate said identity to a router for said wireless communications local area network associated with said handover request; wherein the communications system is arranged to enable a first subscriber associated with said wireless communications local area network to store, at a location accessible to said router, for each of a plurality of mobile communications devices, a subscriber-personalised network handover alert to be announced on the mobile communications device associated with said user identity on entering and/or leaving an area covered by said wireless local area network, wherein the form of said subscriber-personalised network handover alert is selectively determined by said first subscriber, and means to determine, when a handover is requested, whether said subscriber-personalized network handover alert has been configured on said router for communication to said mobile communications device and if so, to communicate said alert to said mobile communications device