Final answer:
To change the font size on Safari on an iPhone, tap the 'aA' icon in the URL bar and select the desired font size. For changes across websites, adjust the default text size in Safari settings under 'Page Zoom'. Alternatively, customize the overall text size via 'Settings' > 'Accessibility' > 'Display & Text Size'.
Step-by-step explanation:
To change the font size on Safari on an iPhone, you can use the following steps:
- Open Safari and navigate to the website where you want to adjust the font size.
- Tap the 'aA' icon located in the top-left corner of the URL bar.
- A dropdown menu will appear with options to adjust font sizes. You can tap the small 'A' to decrease the font size or the large 'A' to increase it.
- If you need the changes to apply across websites, you can adjust the default text size from the Settings app under Safari > Page Zoom.
Additionally, on the iPhone settings, you can go to Settings > Accessibility > Display & Text Size if you want to change the overall text size and other display settings to improve readability.