LONDON, UK – While all three of Canada's national mobile operators have cranked up their 4G speeds over the last six months, Telus still holds a commanding lead, says OpenSignal in its new semi-annual report Mobile Networks Update: Canada.The wireless mapping coverage company examined close to 678 million measurements collected from 31,762 mobile test devices between April 1 and June 29, 2018 in its update on Canada scheduled to be officially released this week.According to the report, average 4G download speeds in Canada rose by at least 5 Mbps for Bell, Rogers and Telus. Bell posted the biggest gains, with its 4G download...