all the big 3 carriers in canada have initially made it so it so you would use your own carriers network within canada, ie rogers customers only use rogers towers, then things got a little different when 3g rolled out, rogers built their network, where as bell and telus shared the cost of building it out but they have made it according to a new technology called Multi operator core network where they build a bell tower, they also make it telus enabled. they just share the tower infastructure, but they have both infastructure in their equiptment shelter. so your husdband on telus 3g hspa is actually connected to the telus network, he is NOT roaming on bell.
