To set an MP3 file for use as custom ringtone system-wide, do the following:
  1. Copy the MP3 files to your phone. ...
  2. Go to Settings > Sound > Device ringtone. ...
  3. Tap the Add button to launch the media manager app. ...
  4. You will see a list of music files stored on your phone. ...
  5. Your selected MP3 track will now be your custom ringtone.
How to Make a Song Your Ringtone
  1. On your smartphone's home screen, tap Apps.
  2. Tap Settings.
  3. Tap Sounds and Notifications. If it's not listed under Quick Settings, scroll down to find it.
  4. Tap Ringtones > Add.
  5. Choose a track from the songs already stored on your phone. ...
  6. Tap the song you want to use.
  7. Tap Done.
  8. The song or audio file is now your ringtone.
Keep reading and get to know how to make a Youtube song your ringtone on Android, iPhone or any other device.
  1. Add a link to the YouTube video. Go to YouTube, find the clip you need to extract the audio from and copy its link. ...
  2. Turn the Youtube video into a ringtone. ...
  3. Save your ringtone. 
Keep reading and get to know how to make a Youtube song your ringtone on Android, iPhone or any other device.
  1. Add a link to the YouTube video. Go to YouTube, find the clip you need to extract the audio from and copy its link. ...
  2. Turn the Youtube video into a ringtone. ...
  3. Save your ringtone.
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