The Measurement of Internet Delivered Audio Services (Midas) research is conducted every six months using respondents from the main Rajar survey.
The latest research in June is the first to include data from people who listen via a mobile phone. It found that 20% of smartphone owners, equivalent to 1.4 million people in the UK, have downloaded a radio app and 53% of them use their radio apps at least once a week.
In addition, 13% of adults have listened to the radio via their mobile. Of those, 54% select the station using specific FM preset and 14% run an app for a specific radio station.
Previous Midas research covered only people who listen through the internet and listeners to podcasts.
The number of consumers who have ever listened to radio via the internet was 16 million in June, down from the 17.4 million who has listened to radio via the internet in November.
The figure is also lower than the 16.9 million in May 2009 and 16.1 million in October 2008.
A spokesman for Rajar said the June 2010 figures cannot be compared to previous results because a new weighting scheme was introduced using the mobile listeners population in addition to the internet listeners population and the podcast users population.
The research found that 31% of adults (16 million) claim to have ever listened to the radio via the internet with 29% listening live, up from 27% in November 2009 and 25% who have used time-shifted listening, up from 23%.
Of the consumers who have used listen again services, 71% said those services had no impact on the amount of live radio to which they listen to, down from 74% in November 2009.
Half the respondents using listen-again services said they are now listening to programmes they did not listen to previously, the same proportion as in December 2009.
Of the 15% of the adult population who have downloaded a podcast, 75% of them said listening to podcasts had no impact on their live radio listening habits and 36% said they now listen to radio programmes they did not listen to previously.
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