Can't use voice and data after last system update on my V40ThinQ

[Android Central Question]

I used to be able to use Map Quest, or any other app while I was talking on the phone but after the last system update (update V405UA20b) I can't. Any ideas how to make my phone work like it did before the update. I am not very happy with it now.

 

[B. Diddy]

Welcome to Android Central! Which carrier? Are you certain VoLTE is still turned on?

And wow, MapQuest! That's a blast from the past.