Astonishing figures from the Three blog:

On the 31st December ’10 we recorded a huge 14TBs (terabytes) of data being used on Three. In 2011, that leapt to a staggering 80TBs of data. In real terms, that’s the equivalent of almost 21 million MP3 tracks or roughly 118,000 movies being downloaded onto smartphones in the UK in just 24-hours.
And it didn’t stop there! You continued using data through to New Year’s Day, with 74TBs used compared to 14TBs the year before.