Wireless coverage mapping expert OpenSignal has released its first ever report on the state of mobile networks within Australia, and its findings are pretty interesting, if not completely surprising: Telstra currently offers the fastest possible download speeds on 4G, but that comes at the cost of slightly higher latency where Vodafone and Optus swing ahead. Vodafone also wins out on the availability of its 4G networks, with a slight advantage over both its competitors.