Called subscriber identification

Subscriber identification is the process of identifying people who are using something that requires a subscription. It's like when you go to a library and the librarian asks you for your library card. This is so they know you have a right to borrow books from the library.

In the same way, when you use a mobile phone or the internet, you have to show who you are. This could be your name, phone number, email address, or other information. This is important because it helps keep everything secure and makes sure that people only have access to what they are supposed to.

Think of it like having a secret code that only you know. When you use your phone or the internet, you have to enter this code to prove that it's really you using it. This way, nobody else can pretend to be you or use your things without your permission.

Overall, subscriber identification is a way to protect your personal information and make sure that only authorized people have access to things that require a subscription.