In addition to GPS, use mobile phone navigation for comparison. Because GPS sometimes points in the wrong direction. I only used Optus card throughout the journey, except for a section of the Great Ocean Road with no signal, everything else was fine. However, it is important to note whether the mobile phone used has the Australian 4G spectrum. Because the 4G spectrum in the country is different, some people often complain about poor reception ?

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OPTUS signal is really bad, not to mention the Great Ocean Road, even Melbourne and Sydney have never had full signal!