i said this already in another thread but i cant find it now so here i go again ..
i was piecing together a little custom dash-board dock to charge the phone and send audio to my car stereo's aux inputs just by sliding the phone into it ... even did a little handsfree mic and answer button ...
i had the same problem with normal 2.5 stereo adapters ... gold plated straight outta radio shack and best buy ... had to pull them out slightly to get all the rings and pins to line up correctly ...
i tried a few cellphone headsets too ... even an old custom adapter i made for a SE P910 and was also working with a HTC Wizard ... none of them worked right either ...
anyway i ended up hacking up the wired stereo headset that came with the phone and playin around to find out which wires did what ... i know, not the most delicate approach but ill never use a wired headset and i wasnt about to stop working on my little dashboard dock project :P gotta love streaming shoutcast and hearing kit from knight-rider (TomTom6 voice) in the background telling you which way to turn in 300 yards ... all through the truck speakers
so i dont know if this will be any help to anyone but heres the message i sent to the one guy that asked about it in the other thread
> i dont know the actual pinout since i didnt try to open up the plug but i know the color codes of the wires and dont mind sharing at all
>
> solid red = right +
> striped red = right -
> solid green = left +
> striped green = left -
> white insulated = mic +
> copper (unpainted) = mic - (common ground)
> blue = call/answer/reject/redial button signal wire
>
> now im pretty sure thats it but it couldnt hurt to play around with the wires once you chop it up ... i sat there with a small mic and a pair of headphones trying different combinations when i figured it all out ...
>
> im not sure of the signifigance considering im a novice but ... the mic - lead will work as ground for the speakers also .... i didnt wire my adapter this way just cause i thought using the correct channel grounds might be safer but i figured i would mention it anyway
>
>also ... not to insult ... incase you know as much as or more than me but if you want to equip whatever you're doing with the call button you can use any simple momentary contact SPST switch to trip the signal wire to the ground ...
>
> anyway, glad i could help