Show my caller ID spinning wheel on iPhone

I had this problem too and I tried everything and nothing worked. I “chatted” online to an Apple person who very obligingly worked with me to troubleshoot a solution. We again tried everything: resets, airplane mode etc etc. then, he suggested I try another sim in the phone to see if it would work. I used my partner’s sim and it worked. The wheel stopped spinning and the toggle switch for turning in my Caller ID worked. Replacing the original SIM card showed the spinning wheel. The online Apple person concluded that the problem was the sim - or putting it another way- it was something my carrier needed to fix. So I immediately went to the carrier’s retail store at the local shopping centre. The customer assistant said it was just a matter of going into their app (which I had on my phone) and changing it there. Bingo! I now have my Caller ID toggle switch back in Settings on my phone and it is working perfectly.