I'm always amazed by how many of my friends still don't know about Spotify's "Extreme" sound quality setting, which comes with Spotify's $9.99 per month "Premium" service.
The "Extreme" sound quality setting streams music in the highest possible sound quality that Spotify offers. It's a feature you might as well enable if you use Spotify's Premium service, as it doesn't cost you extra.
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On smartphones, the default setting is "Automatic," where the quality of the music stream adapts to the speed and signal strength of your carrier network. If you mostly have a good connection, it's likely that Spotify is streaming music at the same quality it would if you used "Extreme," but there's no way of knowing for sure.
To make sure you're always listening to music at Spotify's highest possible sound quality, you can go into its settings and change it to "Extreme." I've rarely experienced skips or buffering while listening to music in "Extreme" quality, even when my connection isn't strong.
Here's how to turn switch to the "Extreme" stream setting on iOS, Android, and the Spotify app for computers: