Electronic device for displaying and updating mobile network operation information and controlling method thereof

A method for controlling an electronic device comprising:

• displaying a contact list including telephone number information of a plurality of external devices and Mobile Network Operator (MNO) information of the plurality of external devices;
• in response to a user command for selecting one of the plurality of external devices included in the contact list being input, establishing a communication connection with the selected external device;
• in response to the communication connection being established, receiving information regarding the MNO information of the external device from the selected external device;
• and
• in response to the received MNO information of the external device being different from MNO information of a pre-stored external device, updating the contact list based on the MNO information of the external device and storing the updated contact list in a memory,
• wherein the receiving comprises receiving, from an external server, notification information that MNO information of at least one external device among the plurality of external devices is changed, and
• wherein the updating comprises:
• in response to notification information that MNO information of at least one external device among the plurality of external devices is changed being received from the external server, receiving changed MNO information of the external device from the external server,
• updating the contact list based on the changed MNO information, and
• storing the updated contact list in the memory.

A system, comprising:

• an electronic device, the electronic device comprising:
• a memory;
• a display;
• a communicator;
• a user inputter;
• and
• a processor operably connected to the memory, the display, the communicator, and the user inputter, and configured to control the electronic device,
• wherein the processor is configured to:
• control the display to display a contact list that includes telephone number information of a plurality of external devices and Mobile Network Operator (MNO) information of the plurality of external devices;
• in response to a user command for selecting one of the plurality of external devices included in the contact list being input, establish a communication connection with the selected external device;
• in response to the communication connection being established, control the communicator to receive information regarding the MNO information of the external device from the selected external device;
• and
• in response to the received MNO information of the external device being different from MNO information of a pre-stored external device, update the contact list based on the MNO information of the external device and store the updated contact list in the memory,
• wherein the communicator is configured to:
• transmit, to an external server, notification information that MNO information of the electronic device is changed, and
• receive, from the external server, notification information that MNO information of at least one external device among the plurality of external devices is changed, and
• wherein the processor is configured to:
• in response to notification information that MNO information of at least one external device among the plurality of external devices is changed being received from the external server, receive changed MNO information of the external device from the external server,
• update the contact list based on the changed MNO information, and
• store the updated contact list in the memory.