It will stay on one Channel, I think 180, which is basically an advertisement for Sirius, until their end is paired with your radio. Sirius has the worst CS that I have ever experienced. Dish runs a close second.
Since you haven't paired your cell phone with the radio yet, you can sit in the car until it works, talking to one of their bimbos.
I think it took me 30 - 45 minutes for them to put the Sirius in the DJ in my name, and add on the time that I had left on my Nitro, which is basically what you are trying to do. I was put on hold a few times, and talked to three or four people (?) until it finally worked. I do get a bill from them, every once in a while for $.56, which I have no intention of paying!