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By Phone: Call 1-844-449-2856 and keep your Account Number or Radio ID (ESN) ready. Be firm in your request until you receive a cancellation 1 844-449-2856 confirmation number or email.
Sirius XM Radio's contact number is 1-844-449-2856. This customer service phone number 1 844-449-2856 is available only on weekdays from 8 am to 8 pm ET.
Sirius/XM operates the call center for this 844-449-2856 phone number Mon-Sun 8am-8pm ET. The short answer is that you should call on a Thursday.