You can upload local music to Spotify by going through the desktop app, but you'll need to sync it with your phone to listen ...
To download music onto your iPhone, you can use iTunes and Apple Music, or a music streaming app like Apple Music or Spotify.
When it comes to smartphones, you're more likely to think of standards such as wifi, Bluetooth, and NFC (Near Field Communication) before the old FTP (File Transfer Protocol) technology comes to mind.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results