Enlarging the icons on the homepage

You can make them slightly larger by going to Settings/Display & Brightness/Display Zoom and choosing Larger Text.

If you need larger than that open Settings/Accessibility/Zoom and turn it on. Be sure to read the instructions on how to use it underneath the setting, as you need to understand Zoom to not get stuck in a situation where the phone isn’t usable.

Open the Settings App. Tap Display & Brightness. Tap Display Zoom and choose Larger Text.

You also get a choice of how much you want to scale the screen when you first set up the iphone.