[sneak]

Signal accounts do not require a SIM. There is no requirement that the phone you use for running the app Signal has the phone number you use for Signal login.

My Signal number is a Google Voice number that has nothing to do with any mobile phone. The Google account has advanced protection turned on so you can’t port it or get the SMSes without a hardware login token.

[HNisCIS]

It's still associated with a credit card and your google account requires another phone number to create.

[the_gipsy]

In my country I cannot buy a SIM card / phone number without giving my full identification.

[extraduder_ire]

Can you buy a phone number from a different country? (genuinely curious, I live somewhere I can buy a sim card with cash, and saw some in the impulse-purchase section of a store earlier today)

[sneak]

So buy a number from a different country.

[codedokode]

But has something to do with a bank card you used to pay for it?

[jazzyjackson]

That's cool that there are phonenumbers without SIMs, my concern was more about SIM swap takeover. (Signal only guards this with a 4 digit PIN iirc)

[Zak]

The PIN can be longer than four digits. Signal also guards against this with safety numbers; if someone takes over an account, every contact will see that the safety number has changed and should consider that the account may be compromised until verifying out of band.

[codedokode]

Google Voice doesn't look like a safe option, your number can be taken away if you forget to pay or you can be banned for arbitrary reason without a way to appeal.