How does Apple 13 receive foreign short messages?

You need to contact the operator to open the international roaming function.

To accept foreign short messages, you need to open a calling card for international roaming. You can contact the operator who uses the calling card to open it in the background. You need to provide your mobile phone password and mobile phone number to open this service.

International roaming means that users can also enjoy a series of services provided by telecom operators abroad, such as phone calls, short messages, multimedia messages, mobile Internet access and so on.