If you dont call or go online to subscribe then they will shut it off at the end of your trial period. You need your vin number or radio id number to subscribe.
I am not sure of the regular monthly price but after I let it lapse they sent me weekly offers for $5 per month. I am sure it is only for 3 or 6 months but if it is lower than their regular price, you should wait for them to make an offer. Immediately after cancellation it was $4.95/month and then it started with $25 for 5 months. I still get mail from them.
And you'll keep getting mail forever until you call and tell them you don't ever want their horribly limited service. So many duplicate pop music stations with the same music you can pick up anywhere in the country on a million FM stations, expect you get the privilege of paying exorbitant fees...
Anyway to actually 'shut off' 'remove' etc the damn thing from the audio choices - or even cut off the signal somehow? I find it really annoying if I get on the SXM channel and get a blast of advertising thanks