The firm, which is one of the UK’s most popular wireless carriers, will be focusing initially on its 5G home broadband service, which will be live in London.
Three CEO Dave Dyson said: "It's clear that consumers and businesses want more and more data. We have the UK's best network for data and we have led the market on customer usage on both 3G and 4G technologies. We have worked hard over a long period of time to be able to offer the best end to end 5G experience. 5G is a game changer for Three, and of course I am excited that we will be the only operator in the UK who can offer true 5G."