Joke Collection Website - Public benefit messages - What is the reason why two Apple mobile phones send messages to each other, but display the third-party mobile phone number? Is it a common ID?

What is the reason why two Apple mobile phones send messages to each other, but display the third-party mobile phone number? Is it a common ID?

Because it's the same apple id.

Apple ID is an authentication system launched by Apple for its products, such as iWork, iTunes Store and Apple Store. As a fully functional account, Apple ID allows users to access various resources of Apple. Because Apple ID can be used for a variety of products and services provided by Apple, it can also be called Apple account, MobileMe account, Mac account, iTunes Store account and iChat account.