#Signal #Lifehack. When you register as new user, Signal asks you to provide "a" phone number where it can send a confirmation code to finalise the setup.
Know that it asks for "a" phone number that can receive messages. It doesn't have to be YOUR phone number. This is not a new feature, it has always been like that. I registered my Signal account using the phone number of a prepaid SIM in a cheap burner phone. I have never used that number since.