Google attaches great importance to assistive technology (AT), so much so that it designed the “TalkBack” Braille keyboard on Android, which allows visually impaired people to type on their phones without additional hardware.
The keyboard has a six-key layout, and each key represents one of six braille dots. It supports Braille Grade 1 & Grade 2 and is currently only available in English. You can turn on the “Talkback” Braille keyboard through the “Accessibility” section of the Android phone settings. The keyboard supports all devices running Android 5.0 or late