Some good news for anyone who uses Spotify on their iPhone – the app has been upgraded and is now fully compatible with iOS 4. That means full support for Apple’s multitasking implementation, allowing you to keep on listening in the background while you surf, update Facebook, play games or use any of your other apps.

Since the release of iOS 4 a few weeks ago, developers have slowly but surely been bringing their apps in line with the features of the new OS. One of the biggest complaints against earlier versions of the iPhone OS was the lack of multitasking, especially when it came to apps like Spotify. Having to keep the app open while you listen cuts off the rest of the device, and seriously hampers the usefulness of the app. Accordingly, this update should be warmly welcomed by users of the music-streaming service.

Along with multitasking, the new version allows playback to be controlled from the lockscreen or the headset remote, a ‘what’s new’ tab featuring newly-released albums and top singles, the ability to share tracks with friends and decreased battery usage.

This all sounds like great news but there is of course a caveat. As with any app, multitasking is only available to those running iOS 4 on the iPhone 4, iPhone 3 GS and iPod Touch (3rd gen). For those interested, the latest version is available, free, from Apple’s App Store now.