Onstar will be free for the first 12 months - offering security and safety features for users - and will cost £79 per year after that.
Also free for the first year is 4G connectivity, although the cost after the first year is yet to be revealed and will be in addition to the £79 for Onstar.
If purchasing Onstar as an optional extra, it will be £395 for the first 12 months, including 4G data allowance.
The company has confirmed that the European headquarters for Onstar will be based at Vauxhall’s UK base in Luton. Advisors will man the phones for the system, and new recruits will be subjected to strict language fluency tests. The Onstar headquarters employs 120 people, most of who are new recruits through the project.
As well as the UK, Onstar is set to be offered in countries like Austria, Belgium, France, Germany, Ireland, Italy, Luxembourg, Netherlands, Poland, Portugal, Spain and Switzerland.