It does seem to work with the Orange San Francisco.
There's a 4-segment plug that fits the SF socket nicely.
It has a cable to a small (2 big sugarcubes?) box. (The cables are flexy, not stiff.)
That box has
- a clip to attach it to clothing
- a microphone
- a socket for a standard 3.5 mm 3-segment headphone plug
- a push switch (nice and easily located by touch, button is the whole top surface, you'd press it towards your body - no ergonomic criticism there!)
A set of Nokia earbuds was included, but the point of the thing is to allow you to use your favourite (no microphone) hifi earphones.
Like I said, it seems to work.
Pressing the button does not change the audio quality (as with iPhone headsets) - BUT a "long press" on the button brings up the music player (from Home screen for example). This is the (stock rom) behaviour some people have accidentally provoked by fiddling with a plug that does not fit the SF nicely!
When the phone is (really, truly) asleep, pressing the button does NOT wake it.
On a strong FM station, with the cable(s) loose fully uncoiled, audio was fine (even with my old Bose active speakers as the 'earphones').
When the phone rings (it rings at the phone, not in your ear) pressing the button answers the call. Another press hangs up. The microphone works during the call.
If you are looking for a way to use decent earphones, or you've wrecked the headset that came with the phone, this is well worth the few quid it cost me.
If anyone was looking even for a pre-wired 4-segment plug that fits the SF nicely (so they could attempt to build an N1-style controller - I have no idea how the SF would take to it), then even for the plug it might be worthwhile.
Edited by oh!dougal, 17 November 2010 - 11:26 AM.