noun
car phone; car telephone
Refers to a telephone installed in a vehicle, common before mobile phones became widespread. Now largely historical.
昔は自動車電話が高級車の象徴だった。
In the past, a car phone was a symbol of a luxury car.
携帯電話 is a mobile phone carried by a person, while 自動車電話 is a phone installed in a car.
Compound of 自動車 (car) and 電話 (telephone).