After Apple's mobile phone was changed to a Japanese card, it was changed to a China card, so it was unable to receive SMS calls. Where can I set it up?

Hello, if your Apple phone is changed to a Japanese card and then to a China card, and you can't receive SMS calls, you can try the following steps to set it up:

1. Open the Apple phone, find the "Settings" icon on the desktop, and click Enter.

2. Find the "Cellular Mobile Network" option on the settings page, and click Enter.

3. After entering the "Cellular Mobile Network" option, find the "Default Voice Number" option and click Enter.

4. You can set which number is the primary number and which is the secondary number here.

5. After completing the above steps, please try to dial your phone, and it will automatically jump to the dialing interface where you choose the primary number or the secondary number.

If the above steps can't solve the problem, I suggest you contact Apple Customer Service for consultation.