How to Increase the Text Size and Icons on an iPhone and iPad
Step 1. On the Settings screen, tap “Display & Brightness”.
Step 2. Then, tap “View” on the Display & Brightness screen.
Step 3. On the Display Zoom screen, tap “Zoomed”.
Step 4. The icons on the sample screen are enlarged to show what the zoomed display resolution will look like. To set this resolution, tap “Set”.
Step 5. A confirmation popup displays with the message that changing the display zoom will restart your iPhone. Tap “Use Zoomed” at the bottom of the screen to use the zoomed display.
Step 6. Don’t be alarmed at this point. The screen will go black for a bit and then return to the Display Zoom screen. The message claimed that your phone will restart, but you don’t have to sign in to your phone again.
Step 7. When you return to your Home screen, the icons and text labels will be larger, as will other text and elements on your phone.
Note: If you have an iPhone 6 Plus or 6S Plus, the Home screen will not change to landscape mode while you’re in zoomed mode. You must go back to the standard display zoom to allow your phone’s Home screen to automatically change to landscape mode when you rotate it.