I have a iPhone 6s and use T-Mobile. I have 5 bars of LTE but no WiFi, Spotify won't play any music and is "connecting". As soon as WiFi is turned back on, it plays normally. This is the first time this has happened. I have logged out and redownloaded the app, but nothing so far has worked.
I am using iOS 10.2 and Spotify version 6.8.0. but these had all been updated for at least a couple of weeks. This problem/glitch started happening out of nowhere. It was working fine an hour before, I turned off my phone, and that's when it started happening.