BT is working with Nokia to develop future applications of 5G technologies.
The two firms have signed a research collaboration agreement, which means they will work together on potential customer use cases for 5G.
BT and Nokia have also committed to creating 5G Proof of Concept trials and developing emerging technology standards and equipment.
It is hoped this could lead to a rollout of ultrafast mobile broadband and new Internet of Things-based technology.
Howard Watson, Chief Executive of BT Technology, Service & Operations, commented: "Our EE mobile business already boasts the biggest 4G network in the UK, which is set to cover 95 per cent of the country by 2020.
"We will build on that foundation to develop the next generation of LTE-Advanced Pro and 5G services over the next few years."
He acknowledged that 5G technology is still in its early stages at the moment, but said its experience has proven that a collaborative approach can help drive success.
Mr Watson said he is therefore "delighted" to be working with Nokia to "drive a common approach to 5G and to develop exciting use cases which bring together our combined experience in fixed and mobile technologies".
Cormac Whelan, Head of Nokia in the UK and Ireland, added that 5G is the "communications technology of the future".
"It will transform how we communicate with each other, as well as communicate with devices and 'things'," he said.
Mr Whelan went on to state that Nokia is very happy to be working with BT in "laying the foundations for 5G adoption in the coming years, and in helping define how this technology will enable exciting and innovative experiences".