Method, communication devices, and storage device for controlling communication

A storage device loaded in an electronic device for performing the following steps of:

• providing a telephone number of a receiver, wherein the telephone number is corresponding to a first area;
• receiving a geographic location of the receiver, having been detected by a network service into which the receiver logs in, wherein the network service is capable of updating and sharing the current location of the receiver;
• defining a second area according to the detected geographic location;
• storing the second area, wherein the steps of receiving the detected geographic location, defining the second area, and storing the second area are repeated successively at predetermined equal time intervals;
• providing the second area where the receiver is located;
• determining whether the first and second areas are the same;
• and
• displaying a warning message if the first and second areas are not the same.

A communication device, comprising:

• a communication unit for receiving a geographic location of a receiver, the geographic location having been detected by a network service into which the receiver logs in, and defining a second area according to the detected geographic location, wherein the network service is capable of updating and sharing the current location of the receiver;
• a storage unit for storing a telephone number of the receiver and the second area where the receiver is located, wherein the telephone number is corresponding to a first area;
• wherein the communication unit and the storage unit perform operations of receiving the geographic location, defining the second area and storing the second area repeatedly in successive predetermined equal time intervals;
• a processing unit for determining whether the first and second areas are the same;
• and
• a display unit, controlled by the processing unit, for displaying a warning message if the first and second areas are not the same.