Pay-by-phone parking is a system of paying for car parking via a mobile app or mobile network operator. It is an alternative to the traditional ways to pay for parking of parking meter or pay and display machines. SMS pay-by-phone parking was first introduced by Vipnet.[1] Since its introduction in Croatian capital Zagreb in 2001 under the name M-parking, the number of registered users has steadily increased. By 2004, the Croatian M-parking scheme was the largest in Europe (with over 130,000 users). Today, pay-by-phone parking is used by millions of people all around the world.[2][3][4]