An apparatus comprising a plurality of subscriber identity modules, SIMs, each SIM corresponding to a different network operator, the apparatus comprising: at least one processor and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to: cause a reception of information from a second device (140, 500), wherein the information indicates a need to utilize the network capacity of the apparatus by the second device (140, 500); detect an identifier of the second device (140, 500) in order to enable identification of the second device (140, 500); determine whether or not to allow the second device (140, 500) to utilize the network capacity on the basis of the identification; upon deciding to allow the second device (140, 500) to utilize the network capacity of the apparatus, cause transfer of data between the second device and an accessed network, wherein the network is accessible with a specific subscriber identity module, SIM, of the apparatus; determine at least one characteristic related to the data transfer caused only by the second device (140, 500) via the apparatus; determine which entity is responsible of invoicing data transfers with respect to the applied specific SIM; cause transmission of information indicating the at least one characteristic to the entity responsible of invoicing data transfers with respect to the selected SIM so as to allow the entity to charge the client corresponding to the second device (140, 500) on the basis of the indicated at least one characteristic; cause a reception of information indicating an assignment of at least one benefit from the entity responsible of invoicing data transfers with respect to the specific SIM, wherein the at least one benefit comprises an increase of balance to a SIM account; and update the information of the corresponding SIM account accordingly. cause a reception of information from a second device (140, 500), wherein the information indicates a need to utilize the network capacity of the apparatus by the second device (140, 500); detect an identifier of the second device (140, 500) in order to enable identification of the second device (140, 500); determine whether or not to allow the second device (140, 500) to utilize the network capacity on the basis of the identification; upon deciding to allow the second device (140, 500) to utilize the network capacity of the apparatus, cause transfer of data between the second device and an accessed network, wherein the network is accessible with a specific subscriber identity module, SIM, of the apparatus; determine at least one characteristic related to the data transfer caused only by the second device (140, 500) via the apparatus; determine which entity is responsible of invoicing data transfers with respect to the applied specific SIM; cause transmission of information indicating the at least one characteristic to the entity responsible of invoicing data transfers with respect to the selected SIM so as to allow the entity to charge the client corresponding to the second device (140, 500) on the basis of the indicated at least one characteristic; cause a reception of information indicating an assignment of at least one benefit from the entity responsible of invoicing data transfers with respect to the specific SIM, wherein the at least one benefit comprises an increase of balance to a SIM account; and update the information of the corresponding SIM account accordingly.