A first terminal device having a predetermined network capacity for communicating with a network and configured to serve as a wireless hot spot, comprising: a plurality of subscriber identity modules, SIM,; and 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 wirelessly from at least one second terminal devices (140, 500) which are separate physical entities than the first terminal device, wherein the information indicates a need to utilize the network capacity of the first terminal device by the second terminal devices (140, 500), and performing for each of the at least one second terminal devices (140, 500): detect an identifier of the second terminal device (140, 500) in order to enable identification of the second terminal device (140, 500); determine whether or not to allow the second terminal device (140, 500) to utilize the network capacity on the basis of the identification; upon deciding to allow the second terminal device (140, 500) to utilize the network capacity of the first terminal device, select an optimal SIM among the plurality of SIMs in accessing the network, wherein the optimal SIM is selected among the plurality of SIMs on the basis of predetermined criteria and data relating to the corresponding second terminal device (140, 500); and cause transfer of data between the second terminal device (140, 500) and the accessed network. a plurality of subscriber identity modules, SIM,; and 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 wirelessly from at least one second terminal devices (140, 500) which are separate physical entities than the first terminal device, wherein the information indicates a need to utilize the network capacity of the first terminal device by the second terminal devices (140, 500), and performing for each of the at least one second terminal devices (140, 500): detect an identifier of the second terminal device (140, 500) in order to enable identification of the second terminal device (140, 500); determine whether or not to allow the second terminal device (140, 500) to utilize the network capacity on the basis of the identification; upon deciding to allow the second terminal device (140, 500) to utilize the network capacity of the first terminal device, select an optimal SIM among the plurality of SIMs in accessing the network, wherein the optimal SIM is selected among the plurality of SIMs on the basis of predetermined criteria and data relating to the corresponding second terminal device (140, 500); and cause transfer of data between the second terminal device (140, 500) and the accessed network. cause a reception of information wirelessly from at least one second terminal devices (140, 500) which are separate physical entities than the first terminal device, wherein the information indicates a need to utilize the network capacity of the first terminal device by the second terminal devices (140, 500), and performing for each of the at least one second terminal devices (140, 500): detect an identifier of the second terminal device (140, 500) in order to enable identification of the second terminal device (140, 500); determine whether or not to allow the second terminal device (140, 500) to utilize the network capacity on the basis of the identification; upon deciding to allow the second terminal device (140, 500) to utilize the network capacity of the first terminal device, select an optimal SIM among the plurality of SIMs in accessing the network, wherein the optimal SIM is selected among the plurality of SIMs on the basis of predetermined criteria and data relating to the corresponding second terminal device (140, 500); and cause transfer of data between the second terminal device (140, 500) and the accessed network. detect an identifier of the second terminal device (140, 500) in order to enable identification of the second terminal device (140, 500); determine whether or not to allow the second terminal device (140, 500) to utilize the network capacity on the basis of the identification; upon deciding to allow the second terminal device (140, 500) to utilize the network capacity of the first terminal device, select an optimal SIM among the plurality of SIMs in accessing the network, wherein the optimal SIM is selected among the plurality of SIMs on the basis of predetermined criteria and data relating to the corresponding second terminal device (140, 500); and cause transfer of data between the second terminal device (140, 500) and the accessed network.