Why do you want to add the main card when sending text messages?

The reasons for sending the main card to add SMS are as follows:

1. After your number is entered by others on the bank website and other places, click the operation of obtaining the verification code, and your number will receive the verification code message sent by the bank;

2. Your number has been put in before, and then put in again after a while. During the use of the first owner, the number registered the bank information through the mobile phone number, so that you may also receive a short message from the bank when using the restarted number; 3, the above situation, I suggest you contact the bank customer service consultation and check the specific situation.