A method for dynamically switching a home mobile network of a user equipment, UE, in which an Embedded Universal Integrated Circuit Card, eUICC, is installed, wherein the home mobile network of the UE is switched from a first mobile network to a second mobile network, the method comprising: sending, by a subscription manager, SM, a mobile network switch message to the first mobile network, wherein the mobile network switch message is used to indicate that the UE needs to switch the home mobile network, and wherein the SM is configured to control and manage mobile network information in the eUICC; after the first mobile network receives the mobile network switch message from the SM and in response to the first mobile network receiving an attach request from the UE, receiving, by the SM, a notification signaling message from the first mobile network, wherein the notification signaling message is used to notify the SM that the UE intends to connect to the first mobile network; and in response to the SM receiving the notification signaling message, sending, by the SM, an activate profile request to the second mobile network, wherein the activate profile request includes an identity of the UE and a request to the second mobile network to activate subscription data, on the second mobile network, of the UE; and sending, by the SM, the mobile network switch message to the UE by using the first mobile network providing the UE only with a service for performing mobile network switching, thereby instructing the UE to switch to a second mobile network; and wherein the notification signaling message comprises at least one of the following items: location information of the UE, a Public Land Mobile Network Identifier, PLMN ID, of a network available to the UE, an Access Point Identifier, AP ID, of a wireless local area network available to the UE, and a service set identifier, SSID, of the wireless local area network available to the UE; and wherein the mobile network switch message comprises subscription information, on the second mobile network, of the UE. sending, by a subscription manager, SM, a mobile network switch message to the first mobile network, wherein the mobile network switch message is used to indicate that the UE needs to switch the home mobile network, and wherein the SM is configured to control and manage mobile network information in the eUICC; after the first mobile network receives the mobile network switch message from the SM and in response to the first mobile network receiving an attach request from the UE, receiving, by the SM, a notification signaling message from the first mobile network, wherein the notification signaling message is used to notify the SM that the UE intends to connect to the first mobile network; and in response to the SM receiving the notification signaling message, sending, by the SM, an activate profile request to the second mobile network, wherein the activate profile request includes an identity of the UE and a request to the second mobile network to activate subscription data, on the second mobile network, of the UE; and sending, by the SM, the mobile network switch message to the UE by using the first mobile network providing the UE only with a service for performing mobile network switching, thereby instructing the UE to switch to a second mobile network; and wherein the notification signaling message comprises at least one of the following items: location information of the UE, a Public Land Mobile Network Identifier, PLMN ID, of a network available to the UE, an Access Point Identifier, AP ID, of a wireless local area network available to the UE, and a service set identifier, SSID, of the wireless local area network available to the UE; and wherein the mobile network switch message comprises subscription information, on the second mobile network, of the UE.