I was wondering... is it possible to use my car's existing cell phone prewiring for an aftermarket cell phone? I know my car has the speakerphone speaker in it (and the mic, I believe). I really want a speakerphone for my cell phone, but cannot find one. I really think this is too complicated, and would be WAY TOO MUCH 'custom' work, but was wondering if anyone has in fact done it, or if anyone thinks it might be possible... Thanks.

(John Shellenberg, can I buy (where?) piezzo buzzers to put on the inside of my car and hook it to the existing alarm module? Thanks.)

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)