Even some newer phones like the Samsung Galaxy J3 (2016) do not support this. For other phones you have to turn the feature on yourself, if it is available. As [Hugh] points out in the video ...
Phone calls over the LTE cellular data network. Voice over LTE (VoLTE) is a voice over IP (VoIP) service that uses the same IP network architecture as LTE data. Although transmitted in IP packets ...
The only difference between the 4G and 5G versions of the Galaxy A16 is the chipset inside, with everything else remaining the same. It sports a 6.7-inch 1080p AMOLED display with a 90Hz refresh rate ...