The invention relates to a method and a telecommunication arrangement for providing a telecommunication connection (TC connection) to a called mobile radio terminal. Routing information are provided to a switch (3) via which a connection establishment to a called mobile radio terminal (2, 2′, 2″) takes place, that regard the forwarding of the connection establishment to a certain mobile radio gateway (51, 52, 53). For providing the routing information data of a insertion card device (4) regarding at least one parameter of those insertion cards is evaluated, that are allocated to a mobile radio gateway upon undergoing the connection establishment and are arranged and administered together in the insertion card device (4). By means of this evaluation one of the administered insertion cards is selected for the mobile communication to the called mobile radio terminal (2, 2′, 2″). The connection establishment is forwarded from the switch (3) to the mobile radio gateway (51, 52, 53) allocated to the selected insertion cards by means of the provided routing information.