You can give any email to find out what are your payment options. https://i.imgur.com/XeSFpRG.png https://i.imgur.com/XeSFpRG.png You've probably given Signal

You can give any email to find out what are your payment options. https://i.imgur.com/XeSFpRG.png https://i.imgur.com/XeSFpRG.png You've probably given Signal your real phone number to use the app. Email should hardly be any more private. Even if you used a burner phone, getting a temp email is a million times easier. I couldve generated 50 working email addresses in the time I wrote this comment.