Method for enhanced policy and/or charging control when a mobile telecommunications network is used by a user equipment corresponding to a subscriber of a mobile virtual telecommunications network , wherein the mobile telecommunications network comprises a first core network , a second core network and a radio access network , wherein the radio access network comprises a radio network element being connected to the first and second core network , wherein the first core network is operated by a first mobile network operator, wherein the second core network and the radio access network are operated by a second mobile network operator, wherein the radio access network is shared among the first and second mobile network operator, wherein the first core network comprises at least one packet data core element and a policy and/or charging control entity , wherein the method comprises the steps of: -- using, by the user equipment , the radio access network , -- collecting and/or generating, by the radio network element of the radio access network , subscriber-related policy and/or charging control data depending on the use of the radio access network by the user equipment , -- transmitting the subscriber-related policy and/or charging control data, from the radio network element to the policy and/or charging control entity , using at least one policy and/or charging control interface (11', 12', 13', 13"), wherein the at least one policy and/or charging control interface (11', 12', 13', 13") comprises: -- a first policy and/or charging control interface related to a direct communication between the radio network element of the radio access network and the policy and/or charging control entity of the first core network , or -- a second policy and/or charging control interface (13") related to a direct communication between the packet data core element and the policy and/or charging control entity . -- using, by the user equipment , the radio access network , -- collecting and/or generating, by the radio network element of the radio access network , subscriber-related policy and/or charging control data depending on the use of the radio access network by the user equipment , -- transmitting the subscriber-related policy and/or charging control data, from the radio network element to the policy and/or charging control entity , using at least one policy and/or charging control interface (11', 12', 13', 13"), wherein the at least one policy and/or charging control interface (11', 12', 13', 13") comprises: -- a first policy and/or charging control interface related to a direct communication between the radio network element of the radio access network and the policy and/or charging control entity of the first core network , or -- a second policy and/or charging control interface (13") related to a direct communication between the packet data core element and the policy and/or charging control entity . -- a first policy and/or charging control interface related to a direct communication between the radio network element of the radio access network and the policy and/or charging control entity of the first core network , or -- a second policy and/or charging control interface (13") related to a direct communication between the packet data core element and the policy and/or charging control entity . <EOS>