Three has doubled its operating profit from £101m to £207m, the operator has announced.
In a statement sent to Mobile, the company revealed its total revenue has risen by 5% to £2,044m.
Three, which now has 7.9 million active customers, said it added 565,000 new customers in 2013, driven by a 12% increase in contract customers.
Following the phased launch of its 4G network which started in December 2013, all of Three’s customers are now on a 4G tariff.
Dave Dyson, Chief Executive Officer, said: ‘In 2013 we challenged the market with a series of innovative initiatives - we abolished roaming charges in eleven countries, we launched a ground breaking pay-as-you-go tariff and we cemented our market leadership on data by continuing to strengthen our network and committing to give our customers 4G at no extra cost.
'In 2014, we will continue to innovate and put customer needs at the heart of our decision making.’
Around 1.7 million customers are already using a 4G device and the seamless transition to 4G for Three’s customers is reflected in strong growth in 4G usage.
4G sites are already live in 36 large towns and cities including London, Birmingham, Manchester, Reading and Liverpool. Three is on track to have 4G live in 50 cities and over 200 towns by the end of the year and 4G will cover 98% of the population by the end of 2015.
Richard Woodward, Chief Financial Officer (pictured), said: ‘2013 saw Three become a bigger and more profitable business, driven by a focus on giving customers what they want.'