If you are a verizon customer, you can call onstar and have the internal phone work work as an additional line in your cell phone account.
http://www.verizonwireless.com/onstar
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H3 Boulder Gray - 2006 Adventure|CD-MP3|XM|Roof Marker Lights|Husky Front Mudflaps|Brush Guard|Rocker Bars|UC Protection|U-Steps|Garmin GPS|Garvin Roof Rack|DVD Headrests|
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