Hi, I believe they keep records on the device used to receive the music. They still list me as having 4 devices and constantly try to get me to reactivate one or another. If I go to the Sirius site they still show them all.
You may not have 4 devices, but they sure do. lol
It's good that Xirius does this though. I had the opportunity to listen to Xirius for a few weeks for free, and I like them. Huge selection of stations.