Method for operating data communication service in mobile communication system

1. A method for operating a data communication service in a mobile communication system, the method comprising:

transmitting a reject data for rejecting data communication service to a user equipment, when the user equipment registered in a first mobile switching center requests the data communication service in a roaming area of a second mobile switching center;

setting the reject data to a pending status in the user equipment;

checking whether the reject data has been set in the user equipment in the pending status when the user equipment requests the data communication service in a home area of the first mobile switching center;

determining whether the user equipment has been registered in the first mobile switching center when the reject data has been set in the user equipment in the pending status; and

providing the data communication service to the user equipment when the user equipment has been registered in the first mobile switching center.

2. The method of claim 1 , wherein the data communication service is a general packet radio service provided by the mobile communication system.

3. The method of claim 1 , further comprising:

rejecting the data communication service, when the user equipment is located in the home area of the first mobile switching center and has not been registered in the first mobile switching center.

4. The method of claim 1 , further comprising:

providing the data communication service to the user equipment, when the reject data has not been set in the user equipment.

5. The method of claim 1 , wherein the reject data is stored in a memory of the user equipment as a pending signal.