The issue is there is no good equivalent to Signal that lets you use a username instead of a phone number as the primary identifier, unless you count OTR, which

The issue is there is no good equivalent to Signal that lets you use a username instead of a phone number as the primary identifier, unless you count OTR, which isn't very user friendly. https://en.wikipedia.org/wiki/Off-the-Record_Messaging#Implementation https://en.wikipedia.org/wiki/Off-the-Record_Messaging#Imple...