You advertise your app by providing a URL to it.
namespros.com/app
In reply to the rest of the post the .mobi extension is going backwards, registration number are dropping upon the realisation that the world doesn't need or want a mobile extension, large Internet companies like Google and Microsoft have sold out and given up on the idea, aftermarket prices have fallen 95%+ and big domainers will sell for "anything". That is a dead market.