Mobile data not working after update of 18.4

Hi
Two days back I updated with the 18.4 to my 15 pro. I could see battery issue which you have answered in other query. My my issue is like my mobile data is not working. Now I could only connect via wifi. Seems to be serious problem without mobile data not able to use any payment also outside. Please help on this.

Hi bro, is the iPhone under warranty by any chance? any recent drop happened that could lead to physical or internal damage?