My cellular data isn't working?

I have an iPhone 6 and recently my data hasn't been working. Say I want to use Spotify without Wi-Fi, so I go into the data settings and turn on Spotify. Then I open the app and it says offline. I go back to settings and it's turned off so I tried turning it back on again then switching back to Spotify and it's turned off again! This happens with all my apps but Snapchat. I have no idea how to fix this so if someone knows please let me know it's super annoying!

Reset

I'm having the EXACT Sam issue, do you know how to fix it yet?