I have an iPhone 5s and updated it to IOS 9 recently. I quickly noticed that I was unable to keep my cellular use turned on with the various apps that I have on my phone. I have tried the fixes I have found on the interwebs but the differences is that I DO have cellular connectivity with most of my apps but I am unable to toggle on and off cellular usage on my phone since updating. Those apps I have toggled to Off remain off even after toggling it back to On, once I go out of the cellular settings it reverts back to the off position. Any thoughts?