The latest Radio Joint Audience Research (RAJAR) figures reveal that radio listening via mobile phone has grown steadily in the last 12 months, with the fourth quarter of 2008 showing a year-on-year increase of 32%. This means that 12.3% of the UK population aged 15 and above has listened to the radio on their phone. Amongst 15 to 24-year-olds there's been an even steeper rise, with 31.1% now having listened to the radio in this way. 15.3% say they listen at least once a week and 2.9% say they listen every day. [Press release (pdf)]