Large, bold, and high-contrast text

Display larger text in apps such as Calendar, Contacts, Mail, Messages, and Notes. Go to Settings > General > Accessibility > Larger Text, where you can turn on Larger Dynamic Type and adjust the font size.

Display bolder text on iPhone. Go to Settings > General > Accessibility and turn on Bold Text.

Increase text contrast where possible. Go to Settings > General > Accessibility and turn on Increase Contrast.