Startup Idea : Phone app, order sit, food is prepared w/o wait

I want to resolve waiting for food when I go out to eat. It would be nice to see local participating restaurants for an application so you can set a time to eat, order food already, and even pay the bill from your phone. The idea is to sit down and have the food ready for you within the first five minutes. The application will set up times and relay the information to the establishment. In return the busy establishments will be able to get food out faster as well as serve costumers faster. Also you can link up credit card data and pay the bill as well as leave a tip right from your phone.