3G relates mostly to internet speed and services. Now they 3.5G (also known as NextG and HDSPLA) and Vivid Wireless use 4G (not available in my area). In most they have increasing faster internet speed.
Although 2G can run internet servises it is very slow so they use older WAP services, above this normal webpage can be downloaded. 3.5 or H is great for remote obs IT connection although I would only recommend Telstra
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