Not only is WhatsApp free to download and use now, it also has its own built-in feature to allow for free phone calls to other fellow WhatsAppers with data usage.  This is a great way to get around horrible long distance or international fees.  Nothing special is required to access data-to-data calling, just that both callers are using their data line and that they know their data plan to avoid any expensive mistakes.  You may not, however, use this method to use emergency services, though.

WhatsApp is not only good with their calling features, they also have their own web interface that lets you browse your account options on your computer.  They handle this through a creative workaround by syncing your web browser with the WhatsApp, letting you browse all the features at a glance.  This also allows you to go through your conversations and call history on a proper screen.  WhatsApp will display which computers have access to your account, and the ability to log them out, which is a nice touch that shows they care about your privacy and security.

There’s no reason why you shouldn’t try WhatsApp at this point.  Even if you’re not the talkative teenage type, it still makes for a great networking tool for business, for example.  The group chat function is one of the best virtual conference tools out there.  Besides, how else are you going to tell office jokes by using 3 emoji’s to all of your co-workers, followed by a reply from the boss posting a meme that motivates, scolds, and 1-ups your joke all at once?  You have to download WhatsApp if you want to know What’s Up.