AT’s widely mocked move to label 4G as 5G is now subject to a legal challenge from rival US operator Sprint.

In January, AT started rolling out a software update to 17 Android phones so they would display a ‘5GE’ (5G Evolution) icon at the top of the screen.

However, these devices are simply using an upgraded version of 4G.

AT was the second US operator to launch a commercial 5G service, however its network is limited to mobile hotspot services in parts of 12 cities in what seemed to be a last-ditch attempt to honour its pledge to go live in 2018.

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At present, there is not a single commercially available smartphone capable of using a 5G service.

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