WhatsApp Calling lets you call your contacts using WhatsApp for free, even if they’re in another country. Currently, WhatsApp Calling is available on Android, iPhone and Windows Phone.
WhatsApp Calling uses your phone’s Internet connection rather than your cellular plan’s voice minutes. Data charges may apply.
Note: You can’t access 911 and other emergency service numbers through WhatsApp. You must make alternative communication arrangements to make emergency calls.
To make a WhatsApp call, simply open the chat with the person you want to call and tap the phone button on top.
When someone calls you, you will see an incoming WhatsApp call screen. You can tap and slide the green button to answer the call, or slide the red button to decline the call. Alternatively, you can tap the message icon on the call screen to decline the call with a quick message.
To switch a call to a video call, you and your contact should be on a voice call. If one person taps the video call button, the other person will see a request to switch to a video call. Once the other person accepts, the call will be switched to a video call.
To switch back to a voice call, you and your contact should be on a video call. If one person taps the button to turn the video off, the other person will be notified. Once the other person turns their video off, the call will be switched back to a voice call.