What is the monthly fee for supplementary business and how to cancel it?

The monthly rent for supplementary business is to show who the other party is when I call you. If it is cancelled, the other party will only display the number when calling you. You can't remember all the contacts corresponding to the numbers. Of course, you will wonder that such a simple function costs 6 yuan, just to find the corresponding name from the address book. Yes, it is such a scam, because it is a "disguised charge", which is the characteristic of Guangdong Mobile, and you can only accept its exploitation silently. Of course, you can choose to change the Unicom card.