A method for activating a SIM card and obtaining balance in real-time, comprising the following steps: the user obtains a SIM card and inserts the SIM card in a mobile communication device; after starting the device, it interface automatically displays the prompting message for registration and activation, and the user completes the registration and activates the SIM card. In the meantime, a preset application program is installed on the SIM card mobile communication device, and the user forms operating record by starting the preset application program. After receiving the operating record, a remote server matches the balance to be obtained and sends the instruction to the telecommunication provider. The docking server firstly verifies the identity validity of service provider, then adjusts the balance of SIM card in real-time and feeds back the balance to the remote server and the remote server feeds back the balance to the user.