https://goo.gl/HP9CE6
You may already be familiar with VoiceOver on the iPhone, which uses screen reading to describe what is on screen for people with limited or no vision. But Apple also works with hearing aid companies to optimize iPhone for people with hearing impairments, beaming the phone's audio directly over Bluetooth.
And some features, like FaceTime, may not be obviously seen as accessibility tools, but since it debuted in 2010 with the iPhone 4 it has allowed millions of iPhone, iPad, and Mac users to communicate visually, from anywhere, using sign language.
These are but some of the ways Apple intends to help promote accessibility.