But in this case they do matter. When you give someone your phone number, you give them the possibility to contact you. And then it should be securely, if it's

But in this case they do matter. When you give someone your phone number, you give them the possibility to contact you. And then it should be securely, if it's possible. A check for "aliveness" of a number can be done without Signal. Just call and see if it is ringing. You get the same information. Your Signal profile name and picture, however, will only be shared when you accept it.