Three's 4G mobile broadband services are now available to 48 per cent of the UK population, it has been revealed.
The company - which introduced super-fast mobile broadband in December 2013 - has spent the last year building up its network coverage.
According to the firm, 3.1 million customers are now reaping the benefits of 4G services; more than a third of its eight million customers.
The firm made super-fast mobile broadband available free of charge to all customers in March, meaning those with 4G-compatible devices in networked areas received a major speed boost.
Dave Dyson, Chief Executive of Three, said: “The rollout of new capacity is progressing well and, most importantly for me, customer satisfaction is higher than ever.
"With an advanced 3G network already in place all our customers are able to benefit from a reliable and high performing network."
Three says the expansion of its 4G coverage will continue in 2015, reaching 98 per cent of the population.
The company is currently deploying equipment to support low frequency 800MHz spectrum, in a bid to significantly enhance both indoor and rural coverage in 2015.
"The addition of low frequency spectrum is just one part of our plans to expand Three’s coverage and bring our network to more people in more places in 2015," Mr Dyson explained.