What does this mobile secondary sign mean?

This is a mobile one-card multi-number service.

1. On the basis of the main card, after opening, four minor numbers and four negative numbers can be opened, all of which can be called to send text messages, and others can also send text messages and call negative numbers.

2. A mobile phone has a mobile phone number (host), and then you set up a secondary card (also a mobile phone number) for this number in the mobile business hall, so that you have two mobile phone numbers in one mobile phone.

Usually, the caller's phone number is your host number. If you dial correctly, add 12583 1 before the caller's phone number, and your secondary card number will be displayed on the caller's mobile phone, so that you have two numbers in one mobile phone, which is very convenient.

4. All expenses are paid by the host number.