History

PHS is a low-cost, easy-to-use mobile phone service that began in Japan in July 1995. The three companies that provided PHS service in Japan at that time were NTT Personal Group, DDI Pocket Group, and Astel Group. CASIO released the PH-100 for use by the DDI Pocket Group.

In addition to the inherent PHS features of compactness, lightweight, and long battery life, the PH-100 had a convenient voice mail feature built right into the unit. It also featured unique CASIO functions such as memo recording, voice alarm, and AI telephone number directory. The release of the PH-100 marked CASIO' s first venture into the PHS mobile phone market. From these beginnings, CASIO went on to develop new multimedia cellular phone terminals that not only handled voice but also text and images.