A method for charging in a telecommunications system, comprising: providing by means of packet data interface apparatus (8, 20) packet data communication services to a first communication terminal, the packet data interface apparatus (8,20) being capable of interfacing between the first communication terminal and a packet-switched data link to another communications terminal and comprising a serving GPRS support node, SGSN, and a gateway GPRS support node, GGSN,; transferring charging messages to charging apparatus (17, 18) for use in performing a charging operation; and storing at a subscriber information store subscription information including charging arrangement information indicative of the charging arrangement for the first communication terminal operating in the telecommunications system; characterised in that the method comprises: transferring the charging arrangement information to the SGSN; and storing at the packet data interface apparatus (8,20) the charging arrangement information for the first communication terminal; and generating by means of the packet data interface apparatus (8,20) charging messages indicative of the usage of the packet data communication services by the first terminal dependent on the charging arrangement information for the first communication terminal, wherein the packet-switched data link is a packet data protocol context and the charging arrangement information is transferred from the SGSN to the GGSN at activation of the packet data protocol context, and wherein the generating of the charging messages is performed by means of the SGSN and the GGSN and comprises determining on the basis of the charging arrangement information for the first communication terminal stored at the packet data interface apparatus (8,20) whether a communication with the first terminal is liable to charging and generating a charging message for the communication if the communication is liable to charging. providing by means of packet data interface apparatus (8, 20) packet data communication services to a first communication terminal, the packet data interface apparatus (8,20) being capable of interfacing between the first communication terminal and a packet-switched data link to another communications terminal and comprising a serving GPRS support node, SGSN, and a gateway GPRS support node, GGSN,; transferring charging messages to charging apparatus (17, 18) for use in performing a charging operation; and storing at a subscriber information store subscription information including charging arrangement information indicative of the charging arrangement for the first communication terminal operating in the telecommunications system; characterised in that the method comprises: transferring the charging arrangement information to the SGSN; and storing at the packet data interface apparatus (8,20) the charging arrangement information for the first communication terminal; and generating by means of the packet data interface apparatus (8,20) charging messages indicative of the usage of the packet data communication services by the first terminal dependent on the charging arrangement information for the first communication terminal, wherein the packet-switched data link is a packet data protocol context and the charging arrangement information is transferred from the SGSN to the GGSN at activation of the packet data protocol context, and wherein the generating of the charging messages is performed by means of the SGSN and the GGSN and comprises determining on the basis of the charging arrangement information for the first communication terminal stored at the packet data interface apparatus (8,20) whether a communication with the first terminal is liable to charging and generating a charging message for the communication if the communication is liable to charging. transferring the charging arrangement information to the SGSN; and storing at the packet data interface apparatus (8,20) the charging arrangement information for the first communication terminal; and generating by means of the packet data interface apparatus (8,20) charging messages indicative of the usage of the packet data communication services by the first terminal dependent on the charging arrangement information for the first communication terminal, wherein the packet-switched data link is a packet data protocol context and the charging arrangement information is transferred from the SGSN to the GGSN at activation of the packet data protocol context, and wherein the generating of the charging messages is performed by means of the SGSN and the GGSN and comprises determining on the basis of the charging arrangement information for the first communication terminal stored at the packet data interface apparatus (8,20) whether a communication with the first terminal is liable to charging and generating a charging message for the communication if the communication is liable to charging.