That information includes cellular carrier name, mobile network code, mobile country code, location, language and version of the device's operating system. (ibtimes.com)
Apple's decision to remove the mobile carrier name from the status bar of the iPhone X is a change telecoms aren't going... (thenextweb.com)
So turn off the annoying persistent carrier text in your status bar by going to Settings > Notification panel & status > Display carrier name and toggling the option off. (androidcentral.com)