You can customize and change your desired ringtone using the built-in feature of the device.
Steps to set a ringtone on Sony Xperia XZ Premium are as follows:
Step 1: Go to sound settings.
Step 2: Select the phone ringtone.
Step 3: Choose the music you desire.
That completes the setup; wishing you all success.
Explore more guides on Sony Xperia XZ Premium here.