Canada’s telecommunications regulator is launching a public consultation to get a clearer picture of cellphone dead zones after several provinces ordered their own studies over concerns that current maps underestimate gaps in coverage. The Canadian Radio-television and Telecommunications Commission issued a call for comments on Thursday on how cellular coverage data are collected and reported, saying the consultation will help it address gaps in coverage and inform funding decisions. “This will help service providers, governments, public safety organizations, and Canadians better...