Aaron has a friend who needs to be totally reliant on voice command. Is there a smartphone that can do that? Leo says that the main issue is apps, and using apps require touch. He could use the Motorola Moto-X with Google Now, but it'll be limited.
Leo recommends contacting the Foundation for the Blind, an independent living resource center. He could also try Lighthouse for the Blind. They're really good at customizing the technology for the need. Doctor Mom in the ChatRoom recommends HelenKeller.org.