Contrary to what liquorice said, I seem to recall Deutsche Telekom, offering either ADSL annex I or annex J, I forget which. In E.g. G.992.3 annex I and J, the lowest tones usually used by voice are available for ADSL, so making your ADSL upstream 160k faster iirc. However, that was ADSL and no one has to my knowledge done such in the UK. I would kill for that. Really want faster upstream.
We discussed this in a thread some years back as I was longing for such a thing.
I use AA’s ADSL, and, as mentioned earlier, AA is trying to get as near as possible to a naked DSL offering, so they are following BT’s developments in this. I have no telephones.