OnStar has gone digital. Older vehicles with OnStar are SOL cause their car won't be compatible.Its analog. It is still useable, many cell phone companies (like Sprint) still maintain analog networks because the signal is more robust. For example... when my high school was built, they put mesh in the walls and ceiling to block cell phone signals. All the current tech digital signals are rendered useless, but I can still make calls on the analog signal (but don't bother trying to text). If you ask really, really nicely, you might be able to get Sprint or Verizon (who operates an analog network for use by OnStar) to hook one of these phones up.