Is there any way of determining if a SIRIUS radio might have a lifetime subscription on it? I recently got an older used SIRIUS radio form an online source. Hooked it up and turned it on to get ready to subscribe only to see that it is already activated and receiving most channels (SIRIUS select package). I went to try subscribe it online anyway and add it to my account as an additional radio, but it won't accept the ESN number. I double checked it, but it still telling me there is a problem with the number. I'm wondering if it could of been a store demo of some kind. Short of calling SIRIUS and talking to a rep, is there any other way of telling it could be a lifetime unit?