Features

• The hands-free calling service is built into the car and operates with a push-button that has the image of a phone on it, according to the company website. The service is then operated with voice commands. The service is paid for with prepaid minutes in addition to the cost of the OnStar subscription.
  
  

Benefits

• OnStar's phone service helps drivers get phone access in areas where cellphone service is limited, according to the company website. It also helps drivers comply with the law in states that ban the use of hand-held cellphones while driving.
  
  

Considerations

• This service is not available everywhere. Calls can only be made in the U.S. and Canada. The vehicle battery, wireless services, and GPS satellite signals have to be working for the service to function properly. The service only operates in hands-free-calling-enabled cars, according to the company website.