Normally Onstar charges $0.30 – $0.47 per minute (depending on how many minute you pre-purchase) to use the built in phone. Well now Onstar and Verizon have a new (well in the last few months) partnership that allows you to use your Verizon cell phone plan minutes for the phone in your car.
This was a smart move for both companies, because my Onstar service is free for the first year with my new car. The cheapest plan ($15/month) is not worth it for me to pay for it at the end of the year. The partnership makes me want to keep the $15/month Onstar plan as well as switch my cell phone service from Sprint PCS to Verizon. Neither company would have made any money from me otherwise.
Too bad the website to get info (like pricing) isn’t really functional right now.