Just updated to iOS 9 on iPhone 5 on AT&T. Turned off wifi and went to use cellular data and noticed the cellular toggle wouldn't stay switched to 'on'. Reset network settings, reboot: nothing. Delete app, reboot, redownload app: nothing. Log in, log out, still can't use cellular data. If I go into the cellular settings, scroll down to Spotify, toggle the switch, go back to the main menu, then RIGHT BACK into cellular settings, the switch has been turned off. Again, im trying to USE cellular, but I can't. I'm at a loss. Any ideas? Thanks, in advance.