We started with the phone because it was easier to get a working prototype out the door and its truly a ubiquitous solution.
We are looking at building an iphone and android app. Its starting to seem like a more viable way to make the service profitable.
I guess that means either finding a niche which justifies the premium product or lowering the cost of delivery. I'm not sure why it is necessary to deliver via voice rather than the user's data connection via the web.