The present disclosure relates to the field of communication technology, and provides a service processing method and a mobile communication terminal. The service processing method includes: when a service configuration request corresponding to a second SIM card has been detected, determining whether a data network for a first SIM card has been enabled, the service configuration request being a request to be transmitted via the data network; and when the data network for the first SIM card has been enabled, transmitting a service configuration request message for the second SIM card via the data network for the first SIM card.