In 1992, following an outbreak of incidents involving wholesale counterfeiting of phone cards, the company is forced to remove cards in denominations of 3,000 and 5,000 yen from the market as a preventive measure. Cards already issued may be exchanged for and equivalent amount of 1,000-yen cards. Acceptance of the 3,000 and 5,000-yen cards as payment for direct-dialing charges is also discontinued.