The easiest way to create your own sonnerie is to download an app that offers a range of options for cutting, mixing and merging audio files into a single ringtone. Several apps are available in the Google Play Store, and most support MP3, M4A, WAV, and OGG file formats.

For example, Inshot MP3 Cutter & Songtone Maker offers three easy-to-use editing tools to cut and cut audio, then merge or mix the clip segments into a single ringtone. It also supports a range of ringtone formats, including MP3, FLAC, OGG, WAV, AAC (M4A)/MP4, 3GPP/AMR, and MIDI.

Inshot also lets you enter the start and stop times of each clip via a numeric value, which is useful for creating more pronounced ringtone effects. It has a variety of other features to help you create a ringtone that matches your style and taste.

Thank you for sharing, I usually change my Samsung phone's ringtone by visiting websites that provide free ringtones to download music, then go to the phone's settings to change it.