OnStar has a page of past models, by the way.
http://www.onstar.com/us_english/jsp/equ..._years.jsp
GM really did a good thing with this invention. It's pretty Apple-like
Chevrolet®
AvalancheTM - 2002, 2003, 2004, 2005
Blazer® - 1999*, 2000*, 2001
Cavalier® - 2003, 2004, 2005
CobaltTM - 2005
ColoradoTM - 2004, 2005
Corvette® - 2004, 2005
EquinoxTM - 2004, 2005
Express® - 2003, 2004, 2005
Impala® - 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
Malibu® - 2004, 2005
Monte Carlo® - 1998*, 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
Silverado® - 2002, 2003, 2004, 2005
Suburban® - 1998*, 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
Tahoe® - 1998*, 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
TrailBlazer® - 2002, 2003, 2004, 2005
TrailBlazer EXT® - 2002, 2003, 2004, 2005
UplanderTM - 2005
Venture® - 1998*, 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
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Pontiac®
Aztek® - 2001, 2002, 2003, 2004, 2005
NOTE: Pontiac Azteks with a VIN (Vehicle Identification Number) below 3G7DA03EX1S525890 do not have OnStar Hands-Free Calling or Virtual Advisor capabilities.
Bonneville® - 1998*, 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
G6TM - 2004, 2005
Grand Prix® - 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
Montana® - 1998*, 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
Montana SV6TM - 2005
Sunfire® - 2003, 2004, 2005
Vibe® - 2005
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Buick®
Century® - 1998*, 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
LaCrosseTM - 2004, 2005
LeSabre® - 1998*, 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
Park Avenue® - 1998*, 1999*, 2000*, 2001*, 2002, 2003, 2004, 2005
RainierTM - 2004, 2005
Regal® - 1998*, 1999*, 2000*, 2001, 2002, 2003
Rendezvous® - 2002, 2003, 2004, 2005
Riviera® - 1998*, 1999*
TerrazaTM - 2005
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Cadillac®
Catera® - 1998*, 1999*, 2000*, 2001
CTS® - 2003, 2004, 2005
CTS-VTM - 2004, 2005
DeVille® - 1996*, 1997*, 1998*, 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
Eldorado® - 1996*, 1997*, 1998*, 1999*, 2000*, 2001, 2002
Escalade® - 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
Escalade ESVTM - 2004, 2005
Escalade EXT® - 2002, 2003, 2004, 2005
Seville® - 1996*, 1997*, 1998*, 1999*, 2000*, 2001, 2002, 2003
SRXTM - 2004, 2005
STS® - 2004, 2005
XLRTM - 2004, 2005
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GMC®
Canyon® - 2004, 2005
Envoy® - 1998*, 1999*, 2000*, 2002, 2003, 2004, 2005
Envoy XL - 2002, 2003, 2004, 2005
Envoy XUVTM - 2005
Jimmy® - 1999*, 2000*, 2001
Savana Passenger® - 2003, 2004, 2005
Sierra® - 1997*, 1998*, 1999*, 2001, 2002, 2003, 2004, 2005
Suburban® - 1998*, 1999*
Yukon® - 1998*, 1999*, 2000*, 2001, 2002, 2003, 2004, 2005
Yukon XL - 2000*, 2001, 2002, 2003, 2004, 2005
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Saturn®
ION Sedan® - 2003, 2004, 2005
ION Coupe® - 2005
L300® L-series - 2003, 2004
RelayTM - 2004, 2005
VUE® - 2002, 2003, 2004, 2005
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HUMMER®
H2® - 2003, 2004, 2005
H2 SUT - 2004, 2005
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Saab®
9-3 Sedan - 2000*, 2001, 2002, 2003, 2004
9-3 Convertible - 2003, 2004
9-5 - 2000*, 2001, 2002, 2003, 2004, 2005
9-7X - 2005
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Oldsmobile®
Aurora - 1998*, 1999*, 2001, 2002, 2003
Bravada® - 1999*, 2001, 2002, 2003, 2004
Eighty Eight® - 1999*
Intrigue® - 1999*, 2001, 2002
Silhouette® - 1999*, 2001, 2002, 2003
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Acura®
Acura 3.5RL - 2002, 2003, 2004, 2005
Acura 3.2TL - 2003
Acura 3.2CL - 2003
Acura MDX - 2005
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Audi®
A4® - 2003
A6® - 2003
A8® - 2003, 2004, 2005
Allroad Quattro - 2003
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Isuzu®
Ascender® - 2003, 2004, 2005
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Subaru®
Outback H6-3.0 Sedan - 2003, 2004
Outback VDC Sedan - 2003, 2004
Outback L.L. Bean Edition - 2003, 2004
Outback H6-3.0 VDC Wagon - 2003, 2004
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Volkswagen®
New Beetle® - 2004, 2005 (except New Beetle convertible)
Golf® - 2004, 2005
GTI® - 2004, 2005
Jetta® - 2004, 2005
Jetta Wagon® - 2004, 2005
Passat® - 2004, 2005
Passat Wagon - 2004, 2005
Phaeton - 2005
Touareg - 2005