Why can't the weather on Apple's mobile phone be displayed?

Because the data access of mobile phone "weather" is closed, just turn on the access in the settings.

Materials/tools: iPhone8 IOS 12.0 system.

There are several steps for Apple's mobile phone to open the "weather" data permission:

First, open "Settings" on the phone desktop.

2. Open the "Settings" page, find "Cellular Mobile Data" and click "Enter" to proceed to the next step.

Third, then go to the bottom of the "Cellular Mobile Data" page and find the "Weather" column.

4. Finally, click the button on the right side of "Weather" to open the data permission and complete the operation.