After update of One UI 3.1 4G volte service is not working

[VR11]

In my samsung M30S after the update of One UI 3.1 4G volte service is not working also manually also network not shown or available any network is not  working. I am also trying all available network ( AIRTEL , JIO ,  Vi, BSNL sim cards but same problem facing. BUT THESE SIM CARD ARE WORKING IN OTHER PHONE PROPERLY.

PLEASE REFIX THESE ISSUE....

I WAITING FOR YOUR SUPPORT AND REPLY...

DO THE NEEDFUL SERVICE FROM YOUR END ..

[sarnandu]

go to settings
connections
mobile network and then check ntework mode either it is in LTE /3G or not if not then turn on LTE mode

[VR11]

Already done this but no network service

[sarnandu]

have you check sim card manager

[VR11]

All done , network issue is still facing only emergancy call

[sarnandu]

if problem persist then go to sim card manager and turn off sim card and then again turn on it after enable then select LTE mode

[AlenSony소니알렌]

Did you reset the network settings ?

[VR11]

Network reset and also factory reset. But no network service shown. Only emergancy service shown

[AlenSony소니알렌]

What it is a serious problem
Other device showing only this device not showing
Is wifi working fine?

[VR11]

Only Wifi working properly