WhatsApp has announced that 100 million calls are made calls each day on its messaging app. Voice calls are relatively new to WhatsApp, having been added to its mobile app last year. But in that time frame, the company said that people are using it to connect with their friends and family.

What this highlights is further proof that people are moving away from traditional phone calls and are instead finding increased usage for messaging apps, specifically Facebook Messenger and WhatsApp.

In addition, this latest metric underscores how significant WhatsApp is to Twilio. As the cloud communication platform begins trading as a public company, one risk that it has shared is that WhatsApp accounted at least 15 percent of its revenue within the first three months of 2016  and no long-term contract exists between the two companies.

The Facebook-owned messaging app uses Twilio’s voice and messaging products to verify new and existing users.