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自1979年12月起,汽车电话作为大容量陆地移动通信业务供商用,揭开了正式移动通信时代的序幕。嗣后,汽车电话业务范围逐渐扩大,到1984年底已普及到日本所有的县公署所在地以及70％的主要城市,主要干线道路。使用汽车电话可以有效地利用时间,但以往的汽车电话只限于在车内使用,通信的自由度受到限制。如果离开车仍能使用汽车电话,那么,通信的自由度将大大提高,这对用户更为有利。
Since December 1979, car phones have been commercialized as large-capacity land mobile communications services, opening the prelude to the era of formal mobile communications. Subsequently, the car phone business was gradually expanded. By the end of 1984, all county offices in Japan had been popularized and 70% of major cities and major trunk roads had been popularized. The use of car phones can effectively use the time, but the previous car phone is limited to use in the car, freedom of communication is limited. If you can still use the car phone to leave the car, then the degree of freedom of communication will be greatly improved, which is more beneficial to the user.