I can't hear calls on my iPhone after iOS 18.1.1 update

I updated my 12 pro to 18.1.1 yesterday and ever since I haven’t been able to hear the call being placed or the person on the other end of the phone. I restarted my phone. I also reset my network settings and it’s still the same. The only way I can hear anything is if it’s on speaker phone. Help!

[Re-Titled by Moderator]