One of the key features for WhatsApp is the ability to make and receive calls over Wi-FI without burning through precious call-time minutes on your cell phone plan. To make a call through WhatsApp, the person you're calling must also have the app installed and set up on their phone to receive calls. Thanks to WhatsApp's integration into the iOS contacts infrastructure, it's as easy making a call through the phone app… assuming people still use their iPhones as actual phones.

If you've ever answered a call on your iPhone, you know exactly how to answer a WhatsApp call. Its the same process, except the call is conducted over Wi-Fi and not your cellular data.

When a call comes in, you have a few options:

(Apologies to Carly Rae Jepsen)