With HD calling or VoIP (Voice over Internet Protocol), inbound and outbound calls happen over the internet instead of through your carrier.
Let's go over the details.
Why use HD calling?
HD Calling offers several benefits, including:
Save on cellular minutes.
Make calls over Wi-Fi when cellular reception is weak.
Make free international calls to other Dialpad users.
Access in-call features like hold, transfer, and recording, etc.
Turn on HD calling
You'll have the option to turn HD calling on/off for inbound and outbound calls.
To turn on HD calling, open the Dialpad app on your device
Go to Settings > Calling Preferences
Select Call Experience > Select HD Calling
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Switch between HD and carrier
Switch your call to your mobile carrier when you're on a 3G network or want to reduce cellular data usage.
To switch to your carrier:
In an active call, select the More menu (that's the three vertical dots)
Select Switch to carrier
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Note
Switching to your carrier requires cellular service.
Tip
On an HD call but heading out of WiFi range?
As long as you're connected to a 4G or higher cellular network, Dialpad automatically switches your call to cellular data, so you don't need to do anything.
Visit this Help Center article to know more about mobile calling.