Don't confuse with 5G network support. This is about Voice Over LTE ( or later on Voice over 5G )
Both telco and phone maker inputs are required for voice calls to take place over LTE ( or 5G )
Thanks for responding. So I have P6Pro US Set.
Did a few checks and tests.. circle life network (M1) whenever make call will drop to 3G or H+ and CANNOT call AND surf net at same time. But the same SIM on iPhone can.
Tried Singtel based SIM it works though for call and net concurrent though network signal will drop to 3G and H+ too.
So my conclusion is P6Pro hardware itself the design is poor, ie. it cannot hold 4G signal in call. AND due to that, for data and call to be concurrent, only those strong Telco (or certified Singtel and Starhub as per Google support website) will be able to support concurrent data and call for 4G.
Hence conclusion - if use P6Pro please switch to Singtel or Starhub based Telco. I just switched to Vivifi (Singtel based) and now I can concurrent surf and