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.
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Step 2: Select the phone ringtone.
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Step 3: Choose the music you desire.
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That completes the setup; wishing you all success.
Explore more guides on Sony Xperia XZ Premium here.