I assume you mean of the one's we visited, but I can't even really answer that one. I only use the wifi from the truck (that is provided by AT&T), I don't have 'service' on my phone - threw away the sim card about 15 months ago. On drives it was common to have service, but once we arrived at sites the last thing I wanted was any sort of service so I didn't really pay attention. I do recall the further north we went the less we had, generally, with next to none on the north end of the Cassiar highway.
You might look for a coverage map from your particular provider for the specific areas you are interested in, it would probably be a better bet.