A method, comprising: registering, by an electronic device, a first subscriber identification module, SIM, to a first core network, wherein the electronic device comprises the first SIM and a second SIM; registering, by the electronic device, the second SIM to a second core network after registering the first SIM to the first core network; transmitting, by the electronic device, a first indication of a preferred transmission band to the second core network after registering to the second core network; receiving, by the electronic device, a second indication of a transmission band from the second core network in response to the second core network determining the transmission band based on the preferred transmission band; receiving, by the electronic device, a third indication of a first paging cycle for the first SIM from the first core network and a fourth indication of a second paging cycle for the second SIM from the second core network, the first paging cycle defining a first set of reception periods for the electronic device to receive paging data from the first core network, the second paging cycle defining a second set of reception periods for the electronic device to receive paging data from the second core network, the second paging cycle being determined by a base station connected to the second core network, and wherein timing of the second paging cycle is generated based on the first paging cycle; and communicating, by the electronic device, with the first core network using the first SIM, based on the first paging cycle and communicating with the second core network using the second SIM based on the second paging cycle, wherein communicating with the second core network is performed by using the transmission band. registering, by an electronic device, a first subscriber identification module, SIM, to a first core network, wherein the electronic device comprises the first SIM and a second SIM; registering, by the electronic device, the second SIM to a second core network after registering the first SIM to the first core network; transmitting, by the electronic device, a first indication of a preferred transmission band to the second core network after registering to the second core network; receiving, by the electronic device, a second indication of a transmission band from the second core network in response to the second core network determining the transmission band based on the preferred transmission band; receiving, by the electronic device, a third indication of a first paging cycle for the first SIM from the first core network and a fourth indication of a second paging cycle for the second SIM from the second core network, the first paging cycle defining a first set of reception periods for the electronic device to receive paging data from the first core network, the second paging cycle defining a second set of reception periods for the electronic device to receive paging data from the second core network, the second paging cycle being determined by a base station connected to the second core network, and wherein timing of the second paging cycle is generated based on the first paging cycle; and communicating, by the electronic device, with the first core network using the first SIM, based on the first paging cycle and communicating with the second core network using the second SIM based on the second paging cycle, wherein communicating with the second core network is performed by using the transmission band.