Signal uses local networking for the account migration functionality: https://support.signal.org/hc/en-us/articles/360007059752-Backup-and-Restore-Messages http

Signal uses local networking for the account migration functionality: https://support.signal.org/hc/en-us/articles/360007059752-Backup-and-Restore-Messages https://support.signal.org/hc/en-us/articles/360007059752-Ba... You scan a QR code with one device and it transfers the entire account state to the new phone.