Neither Signal nor Telegram are acceptable communication systems. Both are isolated and fully controlled by a single company, both require mobile phone numbers

Neither Signal nor Telegram are acceptable communication systems. Both are isolated and fully controlled by a single company, both require mobile phone numbers and unduly trust mobile carriers for user authentication (at least by default), see https://www.bellingcat.com/news/2016/04/30/russia-telegram-hack/ https://www.bellingcat.com/news/2016/04/30/russia-telegram-h....