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Users of online music site Last.fm will have to pay for its mobile phone service starting from next week.
Until now, the site has provided its personalised radio for free for mobiles, making money by placing adverts between songs instead.
However, it now says this is "not practical" and is instead asking users to pay for an ad-free service.
Listening via the web will remain free but charging is a "rational" move, the site's Matthew Hawn told BBC News.
"We think that the best experience is ad-free," said Mr Hawn, Last.fm's head of product.