According to mobile analytics startup Mixpanel, more than 38 percent of iOS mobile devices are now running iOS 8.4, Apple’s latest mobile operating system. That means a growing number of consumers now have access to a free trial of the new Apple Music service, reports VentureBeat. “Dangerous for Spotify,” said Suhail Doshi, Mixpanel’s chief exec. “That’s hundreds of millions of people who can get a free three-month trial with Apple Music.” While Spotify recently expanded to include videos and podcasts for its 75 million users, Apple Music could prove to be a threat to existing music services such as Spotify and Rdio.