Wi-Fi calling is a thing on all major U.S. Wi-Fi calling can make a big difference.Finally, an unlocked phone might not be able to use any of this because the phone didn't go through carrier sales channels. And this will probably only work if you're calling someone on the same carrier because all four U.S. If you're holding on to an old service plan from your carrier for one reason or another you might not just be able to flip a switch in the settings and will have to contact your carrier. While High Quality calling isn't usually a thing you need to pay extra for, this wasn't always the case. When enabled it sends and receives audio at a much higher quality than without it enabled because it sends voice data over a fast connection.
You'll find a setting for it in the network settings or in the phone dialer settings (or both), again depending on your specific phone and carrier. This might be called HD Voice or VoLTE (Voice over LTE) or Enhanced Calling or something similar depending on your network and your phone.
carriers offer some sort of enhanced voice calling on phones sold through their stores.
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