In the shiny, optimistic vision of the future we will all be living in “smart cities” in which self-driving cars will check the best routes after being charged up on intelligent, connected power grids.

Public services and safety will be carefully managed though data, while devices in our homes will talk to each other and the wider world as part of the “internet-of-things”.

Many of these services will be delivered over what is called 5G.

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