WhatsApp has 1.5 billion monthly users across 180 countries, and between May and July 2018, those users spent 85 billion hours on the app. Privacy is one key reason people flock to WhatsApp. It uses end-to-end encryption for all messages — including photo and video — unlike Facebook Messenger and Instagram. WhatsApp is also the go-to app for people who need to make calls abroad, as it allows users to make calls anywhere with 3G, Wi-Fi, or 2G networks.
