I called the mobile phone of a friend who was traveling abroad in China. How does my mobile phone display? Do you know if he is here?

Caller ID can only directly indicate which number you are calling, but this number can be bound to other numbers or dialed through the network. So caller id can't really determine the location of people.

If you make a domestic call while roaming internationally, the current location of the calling party will not be displayed on the domestic phone.

If you use the mobile 4G card to travel abroad, there will be ordinary fees and other functions to remind China Mobile. This is exactly the same as the domestic cost reminder. Of course, only after the global roaming function is completed can there be a prompt function.