How to deactivate onstar<br>Contact onstar. If you want to cancel your onstar service immediately, you will need to contact the company and speak with an adviser. [substeps] The simplest way to speak with an adviser is to press the blue button on the onstar system installed in your vehicle.
Does this next sentence follow, given the preceding text?
You have to call them

Choices:
 A). Yes
 B). It's impossible to say
 C). No