Summarize this article in one sentence.
Streaming music takes a lot of data, and you may quickly find yourself exceeding your monthly limit if you're always streaming on the go. Try to limit listening to music to when you're connected to a wireless network to avoid going over your data limit. There are several apps that will allow you to listen to streaming music without paying. You may have to listen to commercials every few songs unless you pay for a monthly subscription. Streaming apps that support free accounts include:  Spotify Pandora Google Play Music TuneIn Last.fm NextRadio (Select carriers) YouTube has a massive music library, and you can usually find a video or stream of any music you're looking for. Many users have created playlists that you can listen to that feature a variety of artists. You can also create your own playlists to listen to whenever you'd like. If you have a lot of music on your computer, transferring your favorite songs to your phone will allow you to listen to them any time without using any mobile data. Most modern smartphones have at least a few GB of space that you can use for music files.  Android: Connect your phone to your computer. Your Android will appear as a removable drive. Copy your music files to the Music directory on the phone. See How to Add Music to Your Android Device for more information. iPhone: Connect your iPhone to your computer and open iTunes. Select your iPhone and then open the Music tab. Select the iTunes music that you want to sync to your iPhone. See How to Put Music and Videos on Your iPhone for more information.

Summary:
Connect to a wireless network. Download a free radio app. Listen to music on YouTube. Transfer music files from your computer.