Thanks for reply! I have a Samsung phone that De-Googled %100~ (exclude some important Android depencies based on Google). I restored GMS for auth in Signal. After the auth, I uninstalled it back. There is no Youtube, no Google - Chrome, no Spotify etc. Just FOSSed and de-Googled phone. Do I still using Google Services indirect ways because of Signal? Is it possible to be another third-party sharing except phone verification?

Most sane CS player.