if you concerned about phone number and want a private secure foss msgr product https://simplex.chat is your solution.
-uses signal protocol
-encrypted backups that can be exported and imported.
-zero phone number requirements
-security audited Nov 2022, July 2024, January 2025
-hidden profiles with separate passphrase
-multiple profiles, multi incognito profiles (per contact even)
-uni-directional msg relay routing
-random relay servers
-socks / tor routing possible
-desktop may have diffrent profiles, link up mobile device (docking), mobile device profile overlays desktop (like laptop docking into workstation); once undock, desktop profile reappears
-recent investment by Jack Dorsey, among others
-Global Village VC seed round