I need someone to paint my house. Does anyone know that guy who stencils rats around London?

Well, a big part of rocket-ship design is actually engineering, so that is quite different :)

I think if one can design a user interface for Android, there should be a reasonable overlap with the skills required to design a user interface for iPhone :)

Appreciate the sarcasm.

Design is NOT about the way things look or for that matter even work. Design is about that inherent way of thinking that makes you question, understand and then perform actions. So yes, if you are actually good with graphic design at a fundamental level, you are also good with web or iOS or any other new screen devices where elements need to be arranged and form a visual relation.

If there is any one designer who says they are good with mobile design and not web or vice versa, beware, either the person does not their own potential or does not get design.

Designing for any medium has their own constraints and designing for that medium is designing within those constraints.

There are also specifics to other types of design.

Web: sRGB, design with technology in mind (grid systems and other), different views on the same design (mobile, monitor resolution), things that are consistent across browsers.

Mobile apps: platform convention, touch oriented.

I suppose print takes the cake in terms of annoying details, however.