Abstract: A location searching service system in the personal handy phone system (or PHS) is capable of searching for the location of each PHS mobile phone (such as the cordless phones used in homes) and providing the information of where the requested user of the mobile phone is located. A service system specifies the current location of the PHS mobile phone within an extremely small area denoted as a lot number in the address format of the administrative system. In the case of the mobile communication service system of the PHS, each calling area (which is about 1-2 square kms) is a gathering of a plurality of location register areas, each corresponding to the radio propagation range of a base station, being a small area having a radius of about 100 m. The location data of each mobile phone can also be registered in a common database through a PHS exchanger and this can be done for every small area having a radius of about 100 m.