If you're calling, chatting with a representative, or creating a new online profile, you will need your SiriusXM account number or RadioID. Fortunately, these numbers aren't too hard to find. Most car stereos will show display your RadioID (ESN or RID) when you tune to channel 0. However, some models may be different. If you don't see your RadioID, SiriusXM has a list of instructions for each vehicle here. If you have your online account set up, log in and click on the My Account option. Scroll down for your account number and RadioID.