iPhone stuck in activation screen

Hello please I need help, 3 days ago my iPhone X put up a notification that I won't be able to use my cellular network until I update my phone to the latest iOS version 14.7 , my network bar was stuck in searching even when I took out the SIM it still showed searching instead of "no Sim inserted" so I updated it and after a while it stopped showing searching and showed my cellular network, the phone was working fine till the next day it started showing searching again, I went on Google and tried every tip I saw, but nothing worked, it was still stuck in searching, do I tried resetting my settings and it worked and my cellular data was back working, today I turned on my phone and Its back to showing "searching " again, I've taken out the SIM and put in different Sims, still the same thing, no SIM in the phone presently and it's still shows searching, I've tried resetting like before but didn't work this time, so I did a general reset and it still didn't work, things are worse now and my phone is stuck in the activation page saying "unable to activate iPhone because activation servers are unavailable" and my network bar still shows "searching" and there's no SIM in it, help me I'm frustrated

[Re-Titled by Moderator]