Why are the fonts of the two Apple phones different? How to set them up?

Here, taking the iPhone 7 mobile phone as an example, the method of changing the font is as follows:

First, click "Settings" on the mobile phone desktop, as shown in the figure.

2. Then select the "General" option in the setting interface, as shown in the figure.

Third, then open the "auxiliary function" to enter, as shown in the figure.

4. Click the "Subtitle and Close Subtitle" option after entering, as shown in the figure.

5. Then open "Style" to enter, as shown in the figure.

6. After entering, select the "Create New Style" option.

Seven, and then click the "font" option, as shown.

Eight, finally choose the font to set, as shown in the figure.