Pandora has seen its quarterly revenue increase by 55% after adding more than 700,000 net new subscribers to its ad-free music-streaming service.

The numbers come after the company placed caps on mobile listening to counter rising royalty costs relating to its listeners' use on the move.

Those listeners that were affected by the cap either subscribed to Pandora One or opted to pay $1 for unlimited listening through the end of the month. The results mean subscribed listeners are ...