What happened when Apple 12 didn't display the primary and secondary numbers in text messages?

Open the phone settings and enter the cellular network options. Below you will see the default dial-up setting card. After clicking it, you can switch the main card or the auxiliary card at will. Major number and minor number have been set.

A number is divided into two cards, but the secondary card can only be used for data services such as internet access, and can neither send text messages nor make phone calls. In addition to making full use of the package traffic, the main card and the auxiliary card are charged uniformly, and the two cards do not interfere with each other.

In a package, there are two different numbers, and two numbers * * * enjoy this package. The main card pays the fee, and the fee of the auxiliary card is included in the package of the main card, and the main and auxiliary cards realize combined payment.

Is the mobile phone "secondary number" a new target of fraud? Expert: Don't register:

According to Jingdong financial security experts, criminals first use rampant black market transactions to obtain personal sensitive information including user name, bank card number, ID number and mobile phone number reserved by the bank, commonly known as "four big pieces".

Then, the victim's mobile phone number is bound to the secondary number by taking advantage of the vulnerability that the operator's primary and secondary number binding service does not verify the consistency of real names. Once you reply by mistake, you will be hooked. Criminals then took over the victim's mobile phone number, hijacked the SMS verification code of bank card transactions, and then completed the theft of funds from the victim's account through a series of complicated means.

Refer to the above content: People's Network-Mobile phone "sub-number" has become a new target of fraud. Experts: Don't register indiscriminately