When you silence the ringer switch on an iPhone, it mutes incoming call sounds, text tones, and other notification sounds — but visual notifications like banners, badges, and vibrations still happen unless you’ve changed your settings. You’ll still see notification pop-ups on your screen and badge counts on app icons.
If you’re listening to music on Spotify (or any other app) and want to avoid interruptions — like notifications that pause or lower your music volume — using a Focus mode like Do Not Disturb, Personal, or a custom Focus is the better way to go. Focus mode can fully silence all notifications (both sounds and visual alerts) and prevent calls from coming through, unless you’ve set exceptions.
When a notification comes in while music is playing on your iPhone, the music volume may temporarily lower (this is called "ducking") so you can hear the notification sound. But the music usually keeps playing and doesn’t pause. This happens with most audio apps like Spotify, Apple Music, and YouTube when you're playing through the phone’s speakers, AirPods, or Bluetooth devices.
That said, some Bluetooth speakers or car audio systems might handle this differently — occasionally pausing the music instead of just lowering the volume. If that’s happening and it’s not what you want, it could be worth checking the speaker’s settings or seeing if Focus mode helps avoid those interruptions entirely.