The best mobile in Australia is Telstra for coverages and speed because they have the most towers and also I got over 300mbps down and 60mbps up on a crowded tower in the city CBD
I was with EE. They have very good reception, but unfortunately not at my work. Barely any signal in all of the areas I would be during the break. Probably something to do with landscape and other industries around. So I had to switch to other network that I had better experience with. Though they did offer me better home broadband deal when I was terminating my mobile contract. On EE though, I had better roaming (data speed wise) then I have now.
jur4x hey I struggle also in some areas with EE but like many others I was on 02 and it was a complete disaster. EE do Wi-fi calling etc so if you can get onto a Wi-fi network you are on a winner... 👍🏻