Use a braille display with VoiceOver on iPhone
You can use a Bluetooth braille display to read VoiceOver output, and a braille display with input keys and other controls to control iPhone when VoiceOver is turned on. For a list of supported braille displays, see the Apple Support article Braille displays supported by iPhone, iPad, and iPod touch.
Connect a braille display
Turn on the braille display.
On iPhone, go to Settings > Bluetooth, turn on Bluetooth, then choose the display.
On iPhone, go to Settings > Accessibility > VoiceOver > Braille, then choose the display.
Adjust the braille settings
On iPhone, go to Settings > Accessibility > VoiceOver > Braille.
Do any of the following:
Choose contracted, uncontracted eight-dot, or uncontracted six-dot braille input or output
Add Braille tables that appear in the Braille Table rotor
Turn on the status cell and choose its location
Turn on Nemeth code for mathematical equations
Display the onscreen keyboard
Choose to have the page turned automatically when panning
Change the braille translation from Unified English
Change the alert display duration
Adjust the key debounce duration (the timing used between typing and activating commands)
Output closed captions in braille during media playback
On iPhone, go to Settings > Accessibility > VoiceOver > Verbosity.
Choose Braille or Speech and Braille.
For information about common braille commands for VoiceOver navigation, and for information specific to certain displays, see the Apple Support article Common braille commands for VoiceOver on your iPhone, iPad, and iPod touch.