With the phone number, no; and since there's no Signal usage without a phone number, well…. Also, I think somewhere on their website (or some place) they talked about burner phones as if it's a universal phenomena.

Signal has felt "out of place" to me. Odd. It doesn't fit in, doesn't make sense if I think a bit farther about it.

I hope something decentralised comes out of Signal protocol minus the need for a phone number.

Because on every occasion – at least in the case of Signal – they tried to switch, it was a far inferior experience for them, and the leadership behind the app/service took such puritanical decisions that it became evident that the ideology was more important than the people those tools were supposed to help/protect. I don't even bother asking my friends now. In fact, now, for me as well, those (Signal, Matrix, etc.) are just things collecting dust on my spare phone.