Go to your phone's ringtone settings, then choose the option to set a new ringtone. Select the ringtone you downloaded from the available options.Most of these ringtones are compatible with popular smartphones, whether they run iOS or Android. Be sure to check compatibility before downloading.Yes, many phones allow customization of ringtones for different contacts. Consult your phone's manual on how to do this.Creating ringtones from commercial tracks can raise copyright issues. It is recommended to choose legal sources to download already available ringtones.