What is the cost of developing a mobile app (iPhone, Blackberry, Java, Android, etc)?

At Golden Gekko we often get into the debate with clients and partners about what the cost of a mobile app or game should be and even more so with the iPhone SDK. We know that it is possible for a freelance developer to develop a descent looking iPhone app in a couple of weeks for a minimal budget. At the same time developing a market leading app with great design, usability, content and interaction that doesn't crash is not an easy thing. Therefore it was interesting to read what other people have to say about the cost of implementing a mobile app.
"Although iPhone app development can cost as little as $12.000 a well-designed app can cost anywhere from $50,000 to $150,000, take six to eight weeks to develop, and a couple more weeks more to be approved by Apple"

Read more at:
http://apple20.blogs.fortune.cnn.com/2009/05/12/madison-avenue-and-the-app-store/

Now this is still the easy part. Developing an app that works across hundreds or even thousands of devices with different operating systems, screen sizes, navigation input mechanisms and capabilities is a whole different sport. When I worked Vodafone Group a couple of years ago the estimated average cost of developing a mobile game was about 200.000 euro whereof 50% for development and the other 50% porting and testing. Since then life for developer has gotten harder and not easier with more operating systems, screen sizes, touch screens, etc. At the same time budgets for app development have not increased so the only viable solution to deliver great quality apps and games is to make the development process more efficient and this is where Golden Gekko is currently developing all our R&D resources. More to follow...