Comment by flaburgan

I'm sorry but I don't think this guy did his homework correctly. You don't need a phone number anymore to use Signal. You still need one to register, but not to communicate with anyone. You can simply share your username for that. So you can just buy a prepaid card with cash, register, and then throw it away, and it will never be linked to your real identity. Signal is not perfect, but it's still the best we have.