WhatsApp may be making us wait for voice calling functionality, but that hasn't made the messaging service any less popular. CEO Jan Koum has this week confirmed that WhatsApp now sees 700 million monthly active users — up from 600 million in August.

That means WhatsApp has added 100 million users in just five months, and 200 million since the platform was acquired by Facebook for $19 billion last February. Want more impressive numbers? How about this one: WhatsApp users now send more than 30 billion messages every single day.

Despite all those users, neither WhatsApp or Facebook have any plans to monetize the app. Users are asked to pay just 99 cents a year to use it, and there are no ads or in-app purchases. Facebook founder Mark Zuckerberg has previously stated he doesn't want to try to make money from the service until it reaches 1 billion users.

If growth remains strong, that shouldn't take too long — especially with new features like voice calling right around the corner.

WhatsApp is currently available on all smartphone platforms — including Android, BlackBerry, iOS, Nokia S40, Symbian, and Windows Phone — and it's completely free to use for the first year. One of its biggest competitors right now is Line, which announced it had 170 million active user accounts as of October 2014.