9 pins? for speakers... Seems odd, or are we not talking the same pads?

Texrat, I didn't answer, because the only answers one can give are drastic oversimplifications, hence wrong. But if I had, I'd have gone for this sort of oversimplification:

Because the Nokias can do stuff.

It seems wrong in a less harmful way. And as useful, in my opinion (which is that no answer to such a broad question is useful...)

But I'm sure OpOfIg found your answer more helpful than mine would have been, so carry on!