The present disclosure discloses a multi-card mobile terminal and an SIM card data dumping method thereof An MCC and an MNC of a secondary SIM card is compared with data in a white list preset in the mobile terminal. If the secondary SIM card is to be locked, short message data is copied from the secondary SIM card, saved into a short message function module of the mobile terminal, labeled as being from the secondary SIM card and used by a primary SIM card. This helps a user to switch services from one operator to another without substantially affecting use of the mobile terminal, which represents conveniences for the user.