Dummy phones

Every time I've done a search, all I can come up with is either kids phones or someone saying that the question about dummy/fake phones has been asked before but offers no links to where they are.

Can someone point me in the right direction so I can read up on why dummy/fake phones can't be used for parts?

Thanks

I work for a wireless company and all of the "dummy phones" that we have received do not work in any way at all they are basically weighted plastic that is shaped to look exactly like the real phone. There are no individual parts to take out and use in a real phone.

There, that settles that.
Thanks for a direct answer.

Yeah I already tried looking for a trackball at the wal-mart mobility station :P definitely do not work