How is it that dual-card mobile phones automatically proofread traffic and always send messages with secondary cards?

There are two reasons why dual-card mobile phones always use the secondary card to send information when automatically proofreading traffic:

1. For installed third-party software, by default, the secondary card sends messages to the operator system for traffic checking and proofreading. You can find the corresponding option changes in the software settings menu. If the software does not provide the option of changing the visa, you can contact the customer service of the software service provider to consult the change method.

Second, the mobile phone terminal sets the default SMS number as the secondary card, which can be changed in the mobile phone-Settings menu;

Tips: The traffic proofreading function set by the third-party software is not provided by the operator, and there may be cases where the query is incomplete or the query method is not updated in time. It is suggested to contact the customer service of the corresponding operator for traffic inquiry.