AT&T VoLTE stopped working

[DarkSorrow]

For some reason today on my S9+ everytime I'm on a call my service drops to 4G. It used to do 4G LTE when on a call. Anyone else notice this? ATT opened a network trouble ticket on the issue.

 

[claykin]

Most likely a network issue. The carriers are often doing maintenance and pushing software updates. Most fix/improve something while breaking something else.