
Spotify needs a WiFi or mobile data connection to work.
Your playlists should be saved on the Spotify servers, so you shouldn't worry about your playlists being deleted. Though if you have some songs Available Offline (for premiums only), then clearing data might remove the offline access of the songs, which means you have to make them Available Offline again. Hope this helped 🙂.
It’s best to use WiFi instead of mobile data.
If you can’t use WiFi but want to keep mobile data usage low, use Data Saver.
Data Saver reduces the app’s data usage by showing fewer images and reducing audio quality.
Tap Home .
Plug your iPod into your computer by using the USB cable, as usual. Your iPod should appear below Devices in your Spotify window’s left sidebar. The first time you connect your iPod to Spotify, you’ll be asked if you want to erase your iPod and sync it with Spotify. If you want to download the non-purchased music or playlists from Spotify directly, you can turn to TuneCable Spotify Downloader, with which you can download Spotify music to plain formats like MP3, AAC, FLAC, WAV. In this way, you can sync or transfer Spotify music to. I am trying to move all the music from the old Ipod to a spotify playlist which i can then listen to on my new Iphone. So far its working fine but I've hit a hitch. I moved all the music from my old ipod onto a folder on my computer which was ideal. This folder was then imported into the 'Local Files' on my Spotify. If you want to transfer Spotify songs to iPod Music app, you need to firstly download Spotify songs and then convert Spotify songs to iPod compatible audio files like MP3 or other formats. Then, you need to transfer the downloaded and converted Spotify songs to iPod via iTunes or other iOS data transfer app. /can-i-download-my-spotify-playlist-to-my-ipod.html.
Tap Settings .
Switch Data Saver on.
More ways to reduce mobile data usage:
Videos use more data than music due to larger file sizes, but our data usage is comparable to other popular video channels.
Some podcasts feature videos. You can’t turn these videos off, but they only play when you have them on-screen. If you navigate away from the podcast or lock your device, only the audio plays.
Note: When downloading a podcast, only the audio is downloaded, not the video.
The moving visuals in Now Playing is a feature called Canvas - a unique form of artistic expression on Spotify.

These are short and looping, so use very little data. After they’ve looped once, they don’t need any more data to keep playing. They also don’t continue to run in the background.
If don’t want Canvas, you can switch it off:
Tap Home .
Tap Settings .
Switch Canvas (under Playback) off.
The app uses some of your device’s internet bandwidth to play music without buffering.