Where are the pay phones? Do I need a phone card to use them?

Related articles

• Where are the pay phones that can be used to make international calls?
• On the JR WEST ONLINE TRAIN RESERVATION website, can I change or cancel a ticket reservation with a smartphone originally booked on a PC?
• Can I exchange foreign currency in stations?
• What should I do if I don't understand what the station staff is saying?
• My plans have changed so I'd like to change an unused ticket. Where can I change it? Does this involve a fee?