Signal has started rolling out Signal Login, an optional registration method that allows users to create a Signal account without providing a phone number. The feature will be rolled out first on Android and will come to iOS later.
As we previously reported, Signal Login is not a free alternative registration method. Signal requires users who choose to register without a phone number to make a one-time payment. The price at launch is $2.99 / € 3.49, although this may vary by region and currency.
If it’s “free” with a phone number and costs money to use another method (which is another form of PII) then the only explanation I can see is that having your phone number is worth at least $3 more to Signal than having your credit card number. Or maybe the fact that children can have a phone number but not a credit card and having information on kids is worth more to them.