Voice HD relies on the 4G LTE network. It offers superior voice quality where customers can still enjoy high-speed mobile data connectivity while simultaneously being on a call.
On the other hand, VoWiFi uses the WiFi connectivity to make high definition (HD) calls. In circumstances where 4G coverage is not available, customers will be seamlessly transferred to VoWiFi service, hence improving overall call reliability where a strong WiFi signal is available.
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