Phone company Three will attempt to make up for its late entry into the 4G network battle by offering customers an upgrade to the high-speed service for free.
The company said a "simple software upgrade" would be made available "at no extra cost" upon its launch in London, Birmingham and Manchester in December.
The service will be available in 50 cities by the end of 2014.
Like rivals Vodafone and O2, who launched 4G services today, and high-speed frontrunner EE, the company's reach will grow to 95% of the UK by the end of 2015.
More top news
An independent investigation has begun into finances at taxpayer-funded Broadmoor Hospital.
While the economy has shown signs of improving, the number of UK companies issuing profit warnings has hit a six-year high, research shows.
The Child Support Agency has collected £1.2 billion in maintenance over the past year, with £330 million coming direct from pay packets.