These are fare cards that can be used interchangeably on Japan Railways, private railways, subways, and buses. By simply touching a prepaid IC card to the gate, the ticket gate will open, and the fare will be instantly calculated. In the greater Tokyo area, Suica (Super Urban Intelligent Card) - issued by the East Japan Railway - and PASMO - issued by private railways and subways - can be used interchangeably. A range of services is being developed, such as tie-ups with credit cards and point services. The Mobile Suica for mobile phones, which functions as electronic money and can also be used for shopping, is very popular.