Why can't my 86 message show the name of the phone book, only the 86+ number?

My 86-message can't display the phone book name, but only the 86+ number for the following reasons:

1, the name is not displayed, which may be the reason why SIM card and mobile phone store business cards at the same time. Only one storage is used.

If it is not for this reason, there are two business cards with the same phone number in the business card book.

If not, go to the customer service desk to check the machine, which will definitely solve the problem, but everything in the mobile phone is gone, and you have to back it up online.

+86 is the area code of China, so you can't go without it.