Signal is by far the most well known End-to-End Encrypted messenger used today, as well as the simplest. It uses something almost everyone already has to connect you with your friends, a phone number. There is no user name and passwords to remember, which is one of the reasons that make it such a popular choice. The app asks for permission to read your "contacts" list, and then, utilizing a "hash", determins who if any of your contacts are already on Signal, and lets you know. You do NOT have to give access to your "contacts", but you will have to manualy enter every contact you wish you talk to. Our recomendation is using Signal with people whom already have your phone number. While Signal is secure, requiring a phone number to use makes it a bit less private. (While connected, privacy does not equal security)