How Do I Make the Text Bigger on My iPhone?
If you’d like to change the font size on your iPhone to make the default iPhone letters bigger or smaller, it’s an easy process. Although not every app supports Dynamic Type (the setting that tells apps to adjust the text size), many do. To increase text size on your iPhone:
Open the Settings app.
Select Display & Brightness.
Select Text Size.
Adjust the slider to the right until you reach your preferred text size.
How to Change Your iPhone Text Size with Accessibility Settings
If the text size is still not big enough, you can make the text even bigger with your iPhone Accessibility settings. To access these features: