Mobile data use is soaring in the UK

"Whatever it was we all did before the invention of smartphones has clearly been forgotten after it was revealed data usage on the devices has soared by more than 75 per cent in the first quarter of 2011.
We're consuming more and more data through our iPhone, HTC (pictured) and BlackBerry smarthphones
It means owners of iPhone or Galaxy handsets, for example, have used the same amount of data it takes to download 7million mp3 tracks every seven days.
Of all the cities in Metro’s circulation, usage grew the most in Birmingham, in which 102 per cent more data is being consumed every week.
London had an 87 per cent rise – the equivalent of viewing 63million websites every seven days – while people in Edinburgh are now using 72 per cent more data, according to research by Three.
The network says mobile broadband use on computers and tablets, such as the iPad, is also on the rise.
Networks will soon be able to provide internet speeds 16 times faster than current technologies after Ofcom recently unveiled plans for 4G coverage.
Marc Allera, of Three, said: ‘This year, we expect more than 90 per cent of  customers to choose a smartphone when they get a new contract or upgrade.’"
Source:  Data from 3, reported by Metro, 20th April 2011
Note - the report is unclear, but from this related report, the growth seems to be quarter-on-quarter, not year-on-year.  That is, the 75% growth from Q4 2010 to Q1 2011.