PURPOSE: To obtain the position and information of a pager by adding a reservation calling function of the pager to a pager exchange to call the pager with reservation only.

CONSTITUTION: A call number of a pager 10, a message and a call request time are stored in a paging exchange 4 via an exchange 3 by the dialing of a subscriber 1. The call reservation time of the information in the pager 10 is supervised by a timer of an exchange storage program and when a time set by the subscriber 1 comes, the information of the pager 10 is extracted by the exchange storage program to call the pager 10 via a transmitter 5 and an antenna 6 at the set time, the reservation is released automatically from the exchange storage program because the pager 10 is called, and the pager 10 gives the position of the pager 10 and information to the subscriber 1.