If your in-vehicle free trial is ending or you want to start listening to SiriusXM on your satellite radio-equipped vehicle, you're in the right place. Activate by choosing your service below: For Sirius Radios To continue your Sirius service once your trial is over, call 1-866-635-9632 or use the link below to sign up. SIGN UP For XM Radios To continue your XM service once your trial is over, call 1-877-209-0079 or use the link below to sign up. SIGN UP