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No carrier update (I'm on 31.0 with iOS 11.2 beta) so that's not it.
I did just get a text from AT&T that they had upgraded up and down and with in my area. Not the carrier update for Saf but some sort of infrastructure update, I guess. Maybe these two things are related.
 
Tried restarting iPhone a few times, didn’t work.
 
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Here is what worked for me. Disable VoLTE calls. On iPhone go into Settings>Cellular>Cellular Data Options>Enable LTE and select Data Only. Make a call.

I was actually able to toggle Voice and Data back on and it still seemed to work.
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This looks like a cyber attack.

For me, toggling VoLTE off and on seems to have helped.
 
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Turned airplane mode off/on, rebooted twice & it still didn't work. My son is in the hospital & I am unable to call to get an update.
 
Turned airplane mode off/on, rebooted twice & it still didn't work. My son is in the hospital & I am unable to call to get an update.
Try toggling Voice over LTE on and off. From an iPhone go to Settings>Cellular>Cellular Data Options>Enable LTE and select Data Only. Make a call. For me it worked and I was able to toggle it back to Voice and Data.
 
Try toggling Voice over LTE on and off. From an iPhone go to Settings>Cellular>Cellular Data Options>Enable LTE and select Data Only. Make a call. For me it worked and I was able to toggle it back to Voice and Data.

You're a genius!! It worked!!
Thanks a million!! Very appreciative!
 
Thanks, guys. Added a note to the post that a restart is resolving the problem for some users.
That didn’t work for me but the following did for me and one other poster here.

Try toggling Voice over LTE on and off. From an iPhone go to Settings>Cellular>Cellular Data Options>Enable LTE and select Data Only. Make a call. For me it worked and I was able to toggle it back to Voice and Data.
 
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