article_snippet.sent: More than 10 million people have been won over by the promises and have signed two year contracts costing an average of £20 ($30) a month.
article_snippet.sent: Despite this, the figures make clear the step change has not been as remarkable as the major networks - EE, O2, Vodafone and Three - promised.
article_snippet.sent: This has happened because more people are using the service, effectively causing jams on the airwaves.
article_snippet.sent: The only way this can be countered is if the networks spend millions upgrading masts and installing new ones.
article_snippet.sent: The Ofcom figures are based on 120,000 smartphone tests in five sample towns and cities - Edinburgh, Leeds, London, Newcastle and Poole/Bournemouth - between October and December.
article_snippet.sent: The Ofcom figures study found that download speeds in Edinburgh fell by 12.5 per cent between the summer and end of last year.
article_snippet.sent: The speeds for London were unchanged over the same period, while there was no data for the other areas.