The number of daily SMS messages exchanged globally is tough to measure but by some estimates, it may have just been surpassed by the number of WhatsApp message exchanged each day. While speaking on stage during the DLD conference in Germany, WhatsApp CEO confirmed that his cross-platform mobile messaging service now processes more than 50 billion total messages each day. That figure includes 36 billion outbound messages and 18 billion inbound messages. As noted by mobile analyst Benedict Evans, that figure may have surpassed global SMS volumes according to some estimates. Koum also noted that WhatsApp is now home to more than 430 million monthly active users, making it the most popular mobile messaging service in the world by a staggering margin.