Embodiments of this application provide methods, apparatuses, and terminal devices for managing communications services. In an implementation, a method comprises: identifying, by an input device of a terminal device, an operation performed on the terminal device for entering a service mode that prioritizes data services over voice services; sending, by a subscriber identification module (SIM) card of the terminal device, one or more instructions to a network server, wherein the one or more instructions instruct the network server to disable the voice services of the SIM card; and in response to identifying the operation, activating, by the SIM card, the service mode by disabling a function on the terminal device corresponding to the voice services.