How to enable WhatsApp voice calling on your iPhone

Fret not, as you can take it for a spin right now, as users are reporting that they can freely install the newest WhatsApp beta version from the company's website, and be on their merry way. Voice calls on the iPhone version of WhatsApp requires that you have version 2.11.17.444 of the messaging app, which is, unfortunately, still in beta.
1. Download and install the WhatsApp beta from your iPhone;
2. Make sure the people you are trying to call have the beta too, regardless of if they are on an Android handset, or an iPhone;
3. If you decide to go back to the official version, do not install it from the App Store before you have removed the beta, as your chat history might get lost during the overwrite.
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Also, if the other device you are trying to contact has official WhatsApp versions installed from the Play or App Store, calling them would obviously not be possible, as they don't have the latest beta that can be downloaded from the WhatsApp link above. The video below explains the process for jailbroken iPhones, but it should work on your stock Apple handset like that after installation, too.