By Eliza Mcphee for Daily Mail Australia Published: 00:23 EDT, April 8, 2024 | Updated: 00:41 EDT, April 8, 2024 More than a million Australians may no longer be able to call Triple Zero if telecommunications companies switch off the 3G network in the coming months.Telstra will close its 3G network on June 30, while Optus is expected to shut down the service in September. Vodafone switched off 3G for its... Read this story