Lost network connectivity randomly on an iPhone XS running iOS 12.1.4.

Running iOS 12.1.4 (regretfully) on an iPhone XS. i randomly pick my phone up only to find out that the mobile network has disappeared. The control center displays "searching" infinitely (image attached) and i cannot update any carrier settings since my phone already has the latest one.

i cannot make any calls or connect to the internet on mobile data.

The about page displays network and carrier as "Not Available". (Image attached)

The mobile data page is a blank screen. (image attached)

Also, my phone does not detect or notify me if i remove the sim card tray or put it back in. Even without a sim or the tray itself, the phone keeps on searching for a a mobile network.

PLEASE HELP! How do i regain network connectivity on my phone ?

P.S.- Every thing else is A-Okay! Wi-Fi works and the phone's fully functional except for the mobile network.