WhatsApp, a cross-platform messaging service, which is counted among the largest growing apps in the current market, promises users that it will never encourage advertising through its service, AllThingsD reported.

According to a report from AllThingsD, WhatsApp CEO Jan Koum, in an exclusive interview at the D: Dive Into Mobile, said his company has grown bigger than Twitter, processing more than 8 billion inbound and 12 billion outbound messages every day. WhatsApp has attracted hundreds of millions of users across different countries in the world with its free messaging service. It is consistently found among the top rated apps in all smartphones.

WhatsApp's growing success is solely based on its "No Ads" policy, which it strongly abides by and its scanty fee of 99 cents. In less than four years, WhatsApp has more than 200 million monthly active users, while it took nearly 6 years for Twitter to reach that milestone.

Koum also said advertising will never be a part of the service. He believes in ad-free service, which gives users a great experience.

"We do have a manifesto opposing advertising," Koum told AllThingsD. "We're proud of that. Who likes advertising? We're so bombarded with ads so much in our daily lives and we felt that smartphones aren't the place for that. Our phones are so intimately connected to us, to our lives. Putting advertising on a device like that is a bad idea. You don't want to be interrupted by ads when you're chatting with your loved ones."

The free-messaging service generates its revenue with an annual fee of 99 cents, which is a charge to keep advertisements off. He predicts WhatsApp's great success in the future when more people will upgrade to Smartphones.

"We're looking forward to a world with billions of phones," Koum added. "And once that happens it's going to be extremely easy to monetize. But a lot more people need to join the smartphone revolution and a lot more people need to buy more goods on their phones."

WhatsApp's popularity grows as days pass by. In just over the last six months, rumors of Facebook and Google targeting to acquire the service have been making the rounds. But WhatsApp officially falsified all rumors.