It took about 10 days to get ours active. The dealer faxed the form off the day we got the car (despite me telling them twice "make sure you fax it a couple of weeks before we get the car so its active when we pick it up"...). You go in to the settings option ("i") to activate it. If it's all greyed out, it's not active. Once it is active, you use it from the communications menu. I've yet to use it but will have to try it, it sounds very impressive and useful - especially if you end up breaking down in the middle of nowhere as you just hit your "sos" button and ask for help, and they know your exact position from your GPS. Tomorrow when we are out in the car, I think I'll test it and ask for something like "closest macdonalds" and see what happens. It's free for 6 months with the new car and then around £300 per year after that, so I may aswell test it whilst it's free and work out whether it's worth keeping past the free trial.