Spotify is able to work on all connections, be it they are internal or external. You can use Spotify just fine when connected on WiFi, modem, or just the normal cellular data. You have to ensure the speeds are a little more. If your WiFi is shared and your speeds are about 5mbps, then you will be well off sharing with a maximum of 5 or 6 devices to have a good experience. If you exceed this, you may not enjoy the stream so well. However, if you are dedicated to 2mbps, then you are okay with the speeds.