Signal planning one-time payment for optional sign up without a phone number
aboutsignal.com
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The source code doesn't lie: [0] Have a read for yourself in one of the source code comments:
"Buy a Signal Login (or declare an existing one) in order to register without a phone number."
[0] https://github.com/search?q=repo%3Asignalapp%2FSignal-Androi...