The problem with Sirius is that even if you are a subscriber you have to pay extra to use your phone to listen. It's a premium upgrade to your service. As far as I can tell and from what Sirius has told me personally, if you try to log into Sirius without this added premium on your accout your log in will fail everytime. I tried to use the sirius app that Sirius made on my brothers Blackberry Tour and it still won't work.
They need to get on the ball though, because of course there is an App for the damn iPod and iPhone and the blackberry...