The various versions of the mobile app stream a personalized music feed of your favorite music and related recommendations. Up until now, this has been free, but it will soon be chargeable. The ad-free subscription costs $3 a month.
The radio service will become a paid feature on February 15. The Web and desktop versions of the radio will still be free. It will also be free on Xbox Live and Windows Phone 7 phones. New subscribers also get a free trial, letting you stream 50 songs before you have to pay.
Read more of "Last.fm to charge for mobile app" at Crave UK.