When you have found a classic ringtone that delights you, click on the appropriate download button. Check that the ringtone is in the format compatible with your phone.Open your phone's ringtone settings. You can usually do this by going to Settings and then selecting "Sound" or "Ringtones."Look for the option to customize the incoming call ringtone or other notifications. Select the classic ringtone you downloaded from the available options.After choosing your new classic ringtone, be sure to save the settings for them to take effect.