So I have an IPhone 11 and I've felt with the betas and the official apple update. So basically what is happening with your device is that the update is corrupting the SIM card. Usually when the new update comes out it fixes it. It worked with mine for the first week but now it's messed up again. I'm sure their are apps and stuff that can help but honestly I recommend factory resetting your device and not updating it until the apple update is released. It's not going to stop corrupting with the beta and these bad updates.
Aaliyah1269
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Ignore what I just said. Go to settings, then go to general, then go to reset and reset your network settings. I did it and it worked. You might have to renter the wifi password.