Apple does not display primary and secondary numbers when sending text messages.

1. Open the settings, open the phone settings, find the cellular network option and open it. Open the phone settings, find the cellular network option and turn it on.

2. Click the main number to find the mobile phone number column, and then click the main number below. Locate the cell number column, and then click the major number below.

3. Select the interface of mobile phone number tag in China, and select the option of mobile phone number tag. In the interface of China Mobile, select the option of mobile phone number label.

4. Set as Major Number or Minor Number In the new interface, select Set as Major Number or Minor Number to display major and minor numbers.

5. In the new interface, select Set as major number or minor number to display major number and minor number.