O Baby Ringtone

On Android Phones:

1. Open Settings, then choose Sound & vibration.
2. Tap Phone ringtone and select the downloaded MP3 file.
3. Save your selection.

On iPhone:

1. Save the downloaded M4R file to your iPhone.
2. Open Settings, then go to Sounds & Haptics.
3. Tap Ringtone and select the new tone.