Yes, many Xiaomi Redmi and POCO devices can support Wi-Fi Calling, but you may need to enable it manually. The steps depend on whether VoLTE is already enabled on your device.

If VoLTE is not enabled

You must activate VoLTE first, as VoWiFi will not work without it.

• To enable VoLTE, open the phone dialer and enter *#*#86583#*#*. Then switch ON the VOLTE switch in the SIM card settings menu.
• To enable VoWiFi, once VoLTE is active, dial *#*#869434#*#*. Then switch ON the VoWiFi switch in the SIM card settings menu.

To test if VoLTE is working, make a normal call and confirm the mobile network stays on 4G/5G. If it drops to 3G/2G, VoLTE is not functioning.

To test VoWiFi, turn on Airplane mode, enable Wi-Fi only and try making a call. If the call connects, VoWiFi is working.

If VoLTE is already enabled
You can skip directly to enabling VoWiFi by dialling *#*#869434#*#* on your device’s dialer. Then switch ON the VoWiFi switch in the SIM card settings menu.