In Helsinki 57% of public transport single tickets are paid by mobile

"In Helsinki, Finland 57% of public transport single tickets are paid by mobile. In Croatia over half of all parking is paid by mobile. In South Africa you can have your paycheck paid directly to the mobile phone account linked to your mobile banking account. In Soweto a barbershop has more than half of its customers paying by mobile. 20% of London’s congestion charge is paid by mobile. In Slovenia every vending machine, every McDonald’s restaurant, and every taxicab accepts payment by mobile phone. In Kenya the maximum limit of mobile-to-mobile money payments is set to 1 million U.S. dollars per single transaction. And in South Korea, all credit card companies enable their credit cards to the owners’ mobile phones by default, offering to send an optional old-fashioned plastic credit card to the customer’s home address for free."
Source: Figures quoted by Alan Moore on page 8 of his paper The Glittering Allure of the Mobile Society, November 2008