EE and Three have agreed a network sharing deal which will see the mobile broadband providers make a combined £1 billion infrastructure investment.
The arrangement is designed to accelerate the rollout of super-fast 4G broadband around the UK, reports the Financial Times.
EE and Three - which originally had a network-sharing agreement with T-Mobile, prior to its merger with Orange in 2010 - will construct the next phase of their 4G networks together.
They will share mast infrastructure and transmission costs, in a bid to increase the efficiency of their mobile networks.
Both broadband providers are aiming to offer 98 per cent 4G coverage in the UK, with EE intending to reach this target by the end of 2014.
Three hopes to achieve the 98 per cent milestone by the end of next year.
According to the news provider, EE is investing a total of £1.4 billion in constructing its nationwide 4G network.
Three is reported to have set aside £500 million for the same purpose.