Behind the support for point services and payment services of each mobile phone company is the mechanism unique to each mobile phone company.
While many other payment services have a style of "charging and using credit cards, banks, and cash," the payment services provided by each mobile phone company are regular according to the monthly usage amount. Points are given to, and this is a mechanism that can be used for payment.
In other words, when starting a payment service that makes effective use of points, it did not require much initial investment, and it was easy for users to try and get used to.
In addition, the point service of each mobile phone company may give points in various forms in addition to giving points according to the amount used. For example, when a new model is released, a campaign will be held to return points of several thousand yen to 10,000 yen to terminal purchasers, or the amount equivalent to the trade-in amount of the terminal traded in when changing models will be paid in points. Or something.
In other words, if you subscribe to the line of each mobile phone company and use a smartphone, points will be given in some way and you will participate in the point economic zone.