Disclosed is a control method and electronic device, where the method includes: acquiring subscriber identification information sent by a second electronic device, where the subscriber identification information is identification information registered by the second electronic device at a network side; based on the acquired subscriber identification information, registering at the network side through a second communication connection; and detecting a connection state of a first communication connection to the second electronic device, where if the first communication connection to the second electronic device is detected to meet a first predetermined condition, sending a log-off request to the network side through the second communication connection to enable the second electronic device to perform a registration operation based on the subscriber identification information.