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I have an 05 GMC Sierra I just bought 2 months ago. It has Onstar. I received an offer for 3 months free Onstar. But, when I tried to get it, I got a "no phone available" message. I called Onstar and they said I need to upgrade the 05 analogue system to digital. Has anyone had this done? I'm not wanting to pay for the upgrade just to get the free trial.
 

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True, but I thought it was like 04 and under that needed the upgrade. Works well on all my 06 cars. I just have the $13.00 a month package for the phone usage.

Mr. 960
 
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