If you have downloaded a full sonnerie use the app to trim it according to your preferences. Remove unwanted parts and adjust the length for the perfect ringtone.
For advanced customization, consider using dedicated apps. They allow you to cut, edit and add effects to your ringtone. Make sure the app is user-friendly and compatible with your phone.
For a unique touch, experiment with custom sound effects. Add an original intro or fun effects to make your ringtone even more special.
Once you are satisfied with your creation, save the edited ringtone. Use your phone's ringtone settings to apply your new creation to all incoming calls.