How to bind two mobile phone numbers? What are the benefits of binding?

Hello, thank you for using China Mobile Communication. If you are a customer in Jiangsu and want to enjoy the call discount locally, there are family number combinations, family network (local upgraded version) and group packages to choose from. If you want to bind the mobile payment method, you can choose the door-to-door payment service. Due to the different charges and handling methods in different cities, you can call 10086 or log on to the online business hall/for details. For your reference.