Once you have found the sonnerie gratuite you like, click on the corresponding download link. The ringtone will usually be downloaded as an MP3 file.
Go to your phone's ringtone settings and select the newly downloaded MP3 ringtone as the default ringtone for incoming calls.
Adapt your ringtone according to the occasion. Choose a professional ringtone for work, a fun ringtone for relaxing moments, and a festive ringtone for evenings with friends.
The possibility of use for commercial purposes depends on the copyright associated with each ringtone. Be sure to check usage rights before any commercial use.