Major Airtel 4G issue: No internet while on voice call

No incoming voice call while browsing internet on Airtel 4G is major issue then no internet while having voice call.
 
Does switching to LTE+WCDMA only mode in phone Field test help? In that case the phone will fall back to 3G mode during a call

i have kept my phone on Lte preferred mode its same like wcdma preferred mode on 3g phones.

When I keep my phone on LTE only mode i don't get any incoming calls, callers get busy tone coz i think phone calls on 4g is not available right now,

but even after keeping my phone on LTE preferred mode , someone if calls me get busy tone 50% of times, sometimes I am able to get incoming calls and some time not, and sometimes caller even don't get any response ,

ideally it should switch to 3G network , and it does switch but still there is a problem I think its temporary problem .

now I keep my phone on 2g only mode and its working fine and only switch to 4g mode whenever I need to browse internet.
 
one more thing while roaming in non 4g circle...your phone willswitch to 2g mode bypassing 3g, evn if 3g network is available.
 
in my phone its LTE preferred mode , its same like LTE/WDCMA mode
Just enter *#*#4636#*#* in the dialer- this will take you to field test mode- select phone info option and scroll down to preferred network type (it's a dropdown). Select LTE/WDCMA from the list.
 
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