I have Onstar also on my Envoy. I pay $17 per month for the Onstar service - base plan no frills. You can renew for a year instead of paying monthly but they got my charges messed up and I opted for the monthly for now. The phone is extra and I don't use it much because I think it is really expensive. Came in handy a couple of times when I forgot my cell and the time I misplaced it.
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