My understanding is that it roams in North America. Basically it should roam for all regions that you have maps for. For us here in the US, the maps cover the USA, Canada and Mexico. So while I've never tried it, I'd expect it roams if I ever cross into Canada or Mexico for live traffic and such. The customer service rep probably wasn't specific. It's locked to the geographic region that the car was sold in, so NA for Canadian and US vehicles. I know for sure that the service doesn't roam to Europe for example, because I did European Delivery and didn't have the Mercedes me services while in Europe, but I know that EU spec vehicles roam between all the European countries.