Paging in cellular telecommunications systems

In order to ensure that a mobile station is located and paged for a circuit-switched connection in a GSM system which supports data packet switching (GPRS) services, a specific means, a table held by the SGSN, is provided for locating a mobile station in the case where the mobile has moved from the Routing Area in which it was last located to a cell within the same Location Area which does not support GPRS services. The GSM system comprises a plurality of base station controllers (BSS) serving cells in a Location Area (LA), a circuit-switch control (MSC/VLR) for establishing circuit-switched connections to mobile stations within said Location Area, and a packet control (SGSN) for establishing data packet-switching with mobile stations within one or more Routing Areas (RA) within the Location Area. A method of paging includes the packet control, in response to a paging request, consulting information from a table held by the packet control of base station controllers which serve cells in said Location Area which are not part of a Routing Area, and instructing base station controllers to page cells in said Location Area and in particular said cells not forming part of a Routing Area.