Can I use the Ubuntu font in a proprietary application?

Huge Ubuntu fan here, I really like the Ubuntu font, but as far as I know you may only use it in open-source applications. I want to use it in an iPhone/iPad app. Due to Apple's contracts, I can't make the project open-source.

So, the question actually is, is it allowed to use/distribute the Ubuntu font in an iPhone/iPad application (free or paid)? Would be great if that's allowed!

You are not forced to use the font with free/open source applications. The license just states that you must distribute the license together with the font itself. The license also says what you have to do when you modify the font, but this is not your case.

It is very short and you can read it here: http://font.ubuntu.com/ufl/

If you are seeking a more authoritative answer, remember that Canonical is always available to help you: legal AT canonical.com