>> "For registering you need a phone number where you can receive SMS or incoming calls."
For registering, is it possible to use a disposable number? If so, after the number is used for registration, is it ever required again, and exactly is it required to do?
I don't think you ever need it again, but if someone else later owns the number, they could register it with Signal and you would no longer be able to send or receive Signal messages.
>For registering, is it possible to use a disposable number?
Yes, I use a Google Voice number for signal. It's theoretically possible to use something like a payphone or a free inbound number from callcentric, so long as you can receive incoming calls.
It's not required again, though if someone takes over the number they can re-register on Signal. You'll stop receiving messages then, and your contacts will get a warning that your safety numbers changed.
For registering, is it possible to use a disposable number? If so, after the number is used for registration, is it ever required again, and exactly is it required to do?