In accordance with an embodiment, a method for verifying a personal identification number (PIN) code includes: receiving a first PIN code entered by the user, and storing the first PIN code to complete enabling the function of automatically verifying the PIN code of a first subscriber identity module (SIM) card, wherein the first PIN code is used by a terminal device to automatically verify the first SIM card; and verifying automatically the PIN code of the first SIM card in response to the first SIM card being inserted into the terminal device while the terminal device is powered-on or in response to the terminal device into which the first SIM card is inserted being powered-on.