zazing,
onstar IS a cell phone service. I havn't figured out which one though. The unlock and tracking options are via satellite... and possibly cell-based too-- but the cell service is only that-- and I've had trouble with mine in some places off the beaten path. Trust me, don't put all you faith into onstar. A cell phone in your rig is still a necessity in my opinion and this is from experience... not to mention a cell phone is painfully cheaper than using onstar.
gasman
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gasman
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