I have dual Volte SIM cards. I placed both sim cards to my Nokia 6 device. Only one sim card is able to fetch network and another event can not show network of provider. Atleast it can show the network of provider.
Please solve this issue asap.
Please refer to the Nokia 6 user guide:
"Note: On dual SIM capable devices, both SIM1 and SIM2 slots support 4G networks. However, if your SIM1 and SIM2 are both LTE SIM cards, the primary SIM supports 4G/3G/2G networks, while the secondary SIM can only support 3G/2G. For more information on your SIM cards, contact your service provider."