Add Twilio Video (and audio) as a service
Twilio is more than just handling phone calls/messages. They have other products like Twilio Video, which allows for web apps and mobile apps to send/receive video and audio communication, plus recording as well.
As well as there are a lot of apps use for call and massages. Millions of the people like to use WhatsApp for calls and messages. Now a days Tm WhatsApp is get fame and a lot of people use this WhatsApp due to its different features.