As much traffic as travels those roads the relative lack of cell service outside of towns is disgraceful. Cell technology is relatively cheap now and easy to install. Much of those routes could have been covered long ago.
Safety, traffic, users and businesses would all benefit from the expanded service.
However in 4 round trips to Alaska I have never needed service nor felt particularly endangered by the lack of service between towns.
Remember for the vast majority of the roads life there was no cell service. It wasnt invented yet. And people got along just fine.
But now the time has passed and Canada should really urge the providers to get service along the road.