I think you would probably only find polyphonic ringtones for the
6610. When/if you upgrade to that phone from another, you'll notice
any old ringtones you might have had don't transfer over.

Anyway, I think Zingy and maybe others have a basic polyphonic "ring"
tone, but everything else is largely going to be designed to take
advantage of the polyphonic capabilities since that's what people
generally want.