[Summary]
Telephone cards are prepaid cards that can be used at public telephones. No coins are needed and charges are deducted in units of 10 yen. There are a wide variety of card designs, making them popular collector’s items.

Previously, public telephone cards with 100, 300, 320, 500, and 540 unit values ​​were issued, as well as IC telephone cards using IC cards. However, with the spread of mobile phones, the use of public telephones has decreased, and currently only two types of cards are sold: 50 unit values ​​and 105 unit values.