A look at Canada's three biggest cities by a U.S.-based mobile analytics company found different carriers' dominance fluctuated in the second half of this year, depending on the location. For Toronto, the report on RootMetrics' website shows Telus Corp. and BCE Inc. tied for the top overall performance, being the best in both reliability and speed. RootMetrics said that these two carriers "narrowly pulled ahead of Rogers [Communications Inc.] in most categories." Wind Mobile was last out of the four in every category, RootMetrics said. Bell and Quebecor Inc.'s...