How does Apple's mobile phone locate the city weather?

The operation of automatic positioning of weather forecast setting on Apple mobile phone is as follows:

Step 1: Click the "Settings" icon on the desktop.

Step 2: Open privacy and choose location service.

Step 3: Turn on the weather option.

Set the weather according to the following steps:

1, here is the weather, select the button in the lower right corner to enter the city list, and select the plus sign.

2. Enter the name of the city you want to change, and then select Finish to add the city.

3. If you need to delete a city, please hold down the city name, swipe left and select Delete.