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This FAQ answers the questions people search for most about XM radio and SiriusXM radio. Each answer is short and links to full step-by-step guides when you need more detail.

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General questions

Find your Radio ID on channel 0, enter it on the official SiriusXM website or app, choose a plan, and keep the radio on until channels unlock. Full guide: XM radio activation.
Yes, today they are one service. XM and Sirius merged in 2008 to form SiriusXM. Read XM radio vs SiriusXM.
Tune to channel 0 or check your radio settings or the label on the device. See Find your Radio ID.
Usually a few minutes, but it can take longer. Keep the radio on with a clear view of the sky the whole time.
The radio has not received the signal yet. Send a refresh signal while parked outside.
It is a newer in-car platform that combines live satellite channels with on-demand content and personalized recommendations. Some features need the vehicle’s data connection.

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Trials and subscriptions

Many new and eligible pre-owned vehicles include a SiriusXM trial subscription. Almost all new vehicles arrive factory-activated. Check with your dealer or on the official SiriusXM website using your VIN. Full details: SiriusXM Free Trial.
Many plans include app streaming. Get your login at siriusxm.com/getlogin and download the SiriusXM app on your phone or tablet.
Many older radios still work, but some very old models are no longer supported. Enter the Radio ID on the official site to check eligibility.
Your trial will automatically transition to a paid subscription unless you cancel. Check the official SiriusXM website for renewal terms and cancellation options.

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Buying, selling, and transferring

Activate the radio under your own account on the official SiriusXM website. This links the radio to you instead of the previous owner. You may need the Radio ID rather than the VIN if the head unit was replaced. See Transfer SiriusXM to a new car.
Existing subscribers can move service, add a vehicle, or deactivate an old one at siriusxm.com/transfer. Have both old and new Radio IDs ready. Full guide: Transfer SiriusXM to a new car.
Yes, if you no longer own the vehicle. Use siriusxm.com/transfer to deactivate the old radio so you are not charged for a car you no longer have.

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Troubleshooting

The antenna cannot see the sky or the cable is loose. See SiriusXM not working.
The antenna or its cable may be disconnected or damaged. Reconnect it. If the message stays, contact a car audio installer or dealer.
No. Only use the official SiriusXM website, app, or customer care. Third-party activation sites may charge hidden fees or steal card details.
Yes. The SiriusXM app streams on phones, computers, and smart speakers. Streaming access depends on your plan.
Brief dropouts near bridges, tunnels, and dense city streets are normal. Constant dropouts may mean a weak antenna connection.
This is an independent, unofficial guide. It is not affiliated with or endorsed by Sirius XM Holdings Inc. Always complete activation, payments, and account changes on the official SiriusXM website or app, and never share card details on third-party sites.