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Continue to ChatLumia 950 & 950 XL support both VoLTE & VoWiFi. Lumia 550 too has VoLTE support https://nokiapoweruser.com/lumia-950-950-xl-support-both-volte-vowifi-lumia-550-has-volte-support-too/
Lumia 950 & 950 XL support both VoLTE & VoWiFi. Lumia 550 too has VoLTE support https://nokiapoweruser.com/lumia-950-950-xl-support-both-volte-vowifi-lumia-550-has-volte-support-too/