The Share-SIM client mode may be a work mode in which the first device performs cellular mobile communication by using SIM card information of another device. The work mode may include the work mode that the first device enters when there is no available SIM card and there is a need for cellular mobile communication. Therefore, when the first device enters the Share-SIM client mode, it can be determined that the first device currently has cellular mobile communication requirements.
As an example, the first device may be installed with a sharing code such as an application (APP) used for sharing a SIM card, and the sharing code may provide a user interface, and the user interface may receive an instruction for instructing the first device to enter the Share-SIM client mode. If the instruction is received, the first device enters the Share-SIM client mode.
In some examples, the first device may be installed with an application (APP) used for sharing the SIM card. If the user interface of the APP receives the sharing command, it can be considered that the first device shares the SIM card information of another device to achieve the requirements for cellular mobile communications.
In some other examples, when there is no available SIM card in the first device, the received instruction for cellular mobile communication may include at least one of the following: