PURPOSE: To make a test free of charge by providing the test system with a means for setting up a flag showing under testing for automatically displaying the execution of a test in a subscriber's information area at the time of registering a new subscriber.

CONSTITUTION: A mobile radio exchange receives a subscriber registration number inputted by a tester, edits the subscriber's information corresponding to the subscriber in a work area and additionally sets up a testing flag 3. Then data based upon subscriber's information area index information are written in an subscriber's information area 2 in a subscriber's information storage part 1 which is prepared for a new subscriber's radio mobile machine and charge at the time of testing a call from the new subscriber's radio mobile machine is made free. After receiving a test completion number and the testing flag in the subscriber's information area is reset. Even if any route or connection to any terminater is executed, charge in the period of the test is made free of charge.