For Android: Download the Ringtone: Find and download the free ringtone you want to use. You can use dedicated ringtone apps or download them from websites. Access Your Music Settings: Open your phone's "Settings" app and select "Sound" or "Sound & vibration." Choose a Default Sound: Locate the "Default notification sound" option and tap on it. Select Your Ringtone: Browse through your available ringtones and choose the one you want as background music. Save your selection. Adjust Volume: You can also control the volume of your notification sounds in the same settings menu. Make sure it's set to an appropriate level for background music. For iPhone (iOS): Download the Ringtone: As with Android, find and download the free ringtone you'd like to use. You can get ringtones from dedicated apps or websites. Access Your Sound Settings: Open the "Settings" app and tap on "Sounds & Haptics." Select Your Ringtone: Under the "Sounds and Vibration Patterns" section, tap on "Ringtone." Choose the Ringtone: Find your downloaded ringtone in the list of available options and select it. Adjust Volume: You can control the volume of the ringtone in the "Sounds & Haptics" settings as well.