The Note 9 is not on the list for VoLTE at this time. If your friend has VoLTE showing on their device, we'd definitely be curious to know more about their device. Are we sure they aren't on WiFi calling? Do they have all the latest updates on their phone? I would ask her to reach out to us and show us what she is seeing so we can investigate further because the Note 9 is not yet greenlit on VoLTE.