You're going to be out of cell coverage at some point on any highway in Canada outside of the Windsor-Quebec City corridor.

Windsor to Quebec City is further than London to the Scottish border. It takes 24 hours to drive through just Ontario. Etc etc etc.

That said, I do understand the point about having a sat phone; I'm just pointing out that sat phones are a luxury outside the reach of most people in Canada's North. Nothing like living in a frozen desert to really limit the size of a population, and therefore an economy.