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Is it time for 6G already? Traffic analysis says yep
(www.theregister.com)
This is a most excellent place for technology news and articles.
It's not just for that. 3G isn't that overloaded. In my area I get 1-3Mbps on 4G LTE but around 20Mbps on 3G HSPA+.
It's not overloaded because fewer people use it, so it costs more to run those services for less benefit