How to see whether the SMS received by iphone is the primary number or the secondary number?

1. Open the SMS-click ">" behind the SMS contact. Symbol—Click "Information";

2. Enter the details, and you can see that you are using the "primary number" for this conversation/using the "secondary number" for this conversation.

If you are not sure which card is the primary number and which card is the secondary number, you can check it in the settings:

1, enter mobile phone settings-click "Cellular Mobile Network"-look for "Cellular Mobile Number";

You can see the numbers corresponding to the major numbers and minor numbers here.