For iOS Devices Launch the "Settings" app on your iPhone. It's represented by a gear-shaped icon and can usually be found on your home screen.Sound & HapticsScroll down in the Settings menu and tap on "Sounds & Haptics." This is where you can customize your iPhone's sound settings.RingtoneUnder the "Sounds and Vibration Patterns" section, you'll find the "Ringtone" option. Tap on it to access your ringtone settings.Choose a RingtoneYou will see a list of available ringtones. These are the default ringtones that come with your iPhone. Tap on the one you want to set as your new ringtone.Save ChangesAfter selecting your preferred ringtone, simply exit the settings. Your new ringtone is now set and will play when you receive calls.For Both Android and iOS:If you want to use a custom ringtone that you've downloaded or created, follow these additional steps:Locate Your Custom RingtoneIf your custom ringtone is already on your device, make sure you know where it's located. It might be in your device's internal storage or an SD card.Import the Custom RingtoneIn your phone's ringtone settings (as described in the previous steps), look for an option to "Add" or "Import" a ringtone. Navigate to the location of your custom ringtone and select it.Set the Custom RingtoneOnce imported, your custom ringtone should appear in the list of available ringtones. Select it and save the changes.