As follows:

Tools/materials: iPhone13, IOS15, music player 2.3.6.

Method:

1. Click on your favorite song from the music player and set the created ringtone selection as the ringtone.

2. Click Copy and select GarageBand.

3. Long press the music in the GarageBand app and click *** Share from the pop-up window.

4. Click Phone Ringtone - Standard Phone Ringtone.

5. Select Sound and Touch Settings - Phone Ringtone, and just find the prepared ringtone.