Hi Michael. If it's saying "number not in use", the phone is making a call rather than entering a code. That would usually mean either the wrong digits have been entered or it is not a Xiaomi phone.
i tried to enable the wifi call ; after dialing the numbers ONE NZ SAYL THAT THE NUMBER IS NOT IN USE AND there is nothing after the VoLTE ON THE SIM CARD SETTING!
Hi Rafael. Have just checked on this - to verify if VoLTE is actually working, turn off WiFi in a 4G/5G area and make/receive a phone call. If the data connection drops to 3G when the call comes in, VoLTE is not working. If it stays on 4G or 5G, VoLTE is working. Check for the icon as listed in the guide. If you're still unsure, feel free to pop into a PB Tech branch and one of our staff will be able to help out!
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