To set a song as a ringtone on an Android phone, you need to follow those steps. Step 1. Download the song or audio file to your device. Step 2. Head over to Settings, to Sound, then tap Phone ringtone. Click the + icon at the top right of the screen. Step 3. Choose the song you like from your device. After you added a ringtone, it will appear in the list of tones. Select it and press OK to confirm the change.