It works on 2G once its connected to WiFi call try reconnecting WiFi in 2G mode and see if it works.
VoWiFi switching seamlessly to VoLTE during call if you disconnect wifi? call drop if i disconnect wifi, it also take 30+ seconds to switch to VoLTE properly. OnePlus 5.
This setting actually turns on the SIM network even in the airplane mode. After using this setting, you can make normal calls even without Wifi. This setting just bypasses the airplane mode and activates the SIMFollow the steps here.How do I enable WiFi calling on Redmi mobiles?
Answer (1 of 4): This is phone setting feature and is something that can be activated on most new phones running MIUI 11 Follow the instructions below to activate Step 1 If WiFi calling is not enabled or does not show then type ( * # * # 869 434 # * # *) in dialer You will see vowifi carrie...www.quora.com