The new iPhone XS and XS Max may have inherited the iPhone 4's poor cellular connection strength. Several users are complaining of poor or dropped cellular and WiFi connections. While these claims are still just conjecture, they are rapidly growing in number.
https://www.notebookcheck.net/Antennagate-2-0-The-iPhone-XS-and-XS-Max-users-are-complaining-of-poor-cellular-and-WiFi-connections.334706.0.html