Some mobile networks are to be phased out in order to increase security, the UK Culture Secretary has said.
Both 2G and 3G networks will cease under the changes in a bid to free up the spectrum for 5G and any other future network technology.
The move will provide a smoother transition to faster mobile networks, making it easier for new suppliers to enter the market, according to Culture Secretary Nadine Dorries.
In an agreement with the UK's major providers, the measures will provide a range of benefits.
Networks will be simpler to run as operators will not have to deal with the challenges of running up to four types - 2G, 3G, 4G and 5G.
The move will also support Government plans to diversify its suppliers.
It comes as Chinese firm Huawei were banned from providing their network in the UK.
The announcement has been made alongside a commitment to spend £50 million on telecoms research and development projects, and as Ms Dorries visits the US to meet with US Secretary for Commerce Gina Raimondo.
"5G technology is already revolutionising people's lives and businesses - connecting people across the UK with faster mobile data and making businesses more productive," Ms Dorries said.
"Today we are announcing a further £50 million to put the UK at the forefront of mobile connectivity and to make sure our telecoms networks are safe and secure now and in the future.
"We can only do this through stronger international collaboration and I will be meeting with our US allies today as we strengthen our ties on technology."
Hamish MacLeod, director of industry body Mobile UK, which represents all the major UK networks, said it welcomed the decision.
"Switching off 2G and 3G will enable operators to transition fully to more energy-efficient and high capacity networks to the benefit of customers," he said.
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