BSD for a smartphone OS

Actually, isn't the OS for at least one of the Danger products based on BSD? According to the Wikipedia entry for the Danger Hiptop/Sidekick, they supposedly use NetBSD. Of course, vendors don't have to do anything more than reproduce licensing information for such permissively licensed software, and maybe only in obscure places even then, and so the awareness of a technology in the industry never reaches a point where everyone wants to try it out.

Some people praise permissive licensing and may refer to software licensed in such a way as their "secret weapon" or "competitive advantage", but if they're not willing to share their changes, any wider growth of such technologies is likely to lag behind things like Linux where there is a requirement to share and a resulting culture that does so extensively.