Mobile communication terminal

A mobile communication terminal that can be selectively resident in both a first mobile communication network where a data communication and a voice call can be performed and a second mobile communication network where data communication faster than in the first mobile communication network can be performed, the mobile communication terminal being set to be preferentially resident in the second mobile communication network in a case where the data communication is performed and being adapted to switch the mobile communication network so as to be resident in the first mobile communication network in a case where the voice call is performed, the mobile communication terminal comprising:

• a location registration requester that makes a request for a location registration in each of the both mobile communication networks to the second mobile communication network;
• a location registration response receiver that receives a location registration response representing a result of the location registration in the both mobile communication networks in response to the request for the location registration made by the location registration requester;
• a location registration determiner that determines whether or not the location registration only in the second mobile communication network between the both mobile communication networks is completed, based on the location registration response received by the location registration response receiver;
• a first mobile communication network switching controller configured to perform a switching control of the mobile communication network;
• a residence prohibiter that causes the mobile communication terminal to remain resident in the first mobile communication network and prohibits the mobile communication terminal from residing in the second mobile communication network when the location registration determiner determines that the location registration only in the second mobile communication network is completed.