Yeah accessibility is a big thing here in Australia. We have some of the toughest requirements in the world in the context of developing web based content.
IOS and Android Smartphones have accessibility mode, which can act as a screen reader. They are able to read things like app names, websites, e-mails and messages. They can also use apps as long as the screen reader can support the content (in general HTML5 apps)
It can guide them in using a mobile application. They use different gesture control to interact with the phone.
I have built a couple of basic apps using jQuery Mobile and the accessibility mode on Android was working reasonably well. I have never tested a CP module to see if it works.
This is an old video but it gives you a general overview of accessibility on iphone.
iPhone VoiceOver Function For People With Disabilities - YouTube