To actually use the phone, pick up the receiver and insert your telephone card or coin. You will then hear a dial tone and can place your call. If you are using coins, you will hear a loud beep signaling that your last 10 has started to be used. For phone cards you can see the number of points left on your card on the digital display on the phone. You may also find two other types of public phones in Tokyo, red and pink ones.
Red phones accept only coins, but a phone call is made the same way as green phones.
Pink phones are so called private phone. You can find those mainly in restaurants and cafeterias or private shops. These phones are actually the same as green ones and you can make a call in the same way. Some of these pink phones also accept telephone cards. Public telephone booths for the disabled can be found in central areas of Tokyo.