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Some applications allow you to cut, edit and personalize your sonnerie mp3. Take advantage of these features to create a unique ringtone.
Make sure the ringtones you choose are compatible with your phone. Common formats are MP3 for Android and M4R for iOS.
On Android, it's easy to set a default ringtone, create playlists, and manage your ringtones. For iOS users, iTunes or third-party apps can be used.