What should I do if the iphonexr secondary card can't receive the information?

Iphonexr secondary card can't receive information, which may be a hardware problem of the mobile phone and needs to be repaired. Master card and slave card have the following two situations:

1, a number is divided into two cards, but the secondary card can only be used for data services such as internet access, and SMS and phone calls cannot be used. In addition to making full use of the package traffic, the main card and the auxiliary card are charged in a unified way, and the two cards do not interfere with each other.

2, in a package, there are two different numbers, 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. The primary card users choose the basic package, and the secondary card users can * * * enjoy the benefits of voice, SMS, MMS, data flow, WiFi duration, prepaid phone bill return or free phone bill in the primary card basic package.