美国于3年前开通蜂窝式汽车电话时,仅在工资生活者、建设业者或大企业干部等极有限的层次中使用。而如今,用户已扩大到修理业者、不动产业者、医生以及记者编辑等不同层次,并向多样化发展。在用户范围扩展的同时,其使用方法也趋于多种多样。据说在加利福尼亚州的 When the United States opened cellular phone three years ago, it was used only at very limited levels, such as wage-earners, builders and large enterprise cadres. Today, however, users have expanded to include the repair industry, real estate developers, doctors and journalists at various levels and to diversify. At the same time as the user’s scope is expanded, the ways of using it tend to be varied. It is said that in California