Do you mean the phone button that was fitted to cars with the Symphony head unit? If so then I don't believe they ever got round to fitting the kit before the car went on sale. The BMW system might work, but AFAIK it's a bit of a faff to install.
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Current car: BMW x3 2.0d (The one with the M47 engine!)
Rolled off the line on December 14th, 2004.
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