Just because you have them in your contacts, doesn't mean they have you in theirs. Also, IIRC Signal uses a hash of the phone number to display if one of your

Just because you have them in your contacts, doesn't mean they have you in theirs. Also, IIRC Signal uses a hash of the phone number to display if one of your contacts is also using Signal. I understand how that notification might feel creepy at first, but if you understand what actually happens it de-escalates from "creepy" to merely "convenient".