Signal vs WhatsApp


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Signal
Privacy is possible, Signal makes it easy. Send high-quality group, text, picture, and video messages, all without SMS and MMS fees. Signal alternatives for business are Slack, Hipchat, Microsoft Teams.
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WhatsApp
WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for iPhone, BlackBerry, Android, Windows Phone and Nokia and yes, those phones can all message each other! Because WhatsApp Messenger uses the same internet data plan that you use for email and web browsing, there is no cost to message and stay in touch with your friends. Secure WhatsApp alternatives are Signal and Telegram.
WhatsApp has better video than Signal