By default, calls are made over the 2G or 3G network, depending on reception; if we enable VoLTE (Voice over LTE) on the Xiaomi smartphone, calls are made over the 4G data network, which improves voice quality, speeds up call setup and conserves battery life.
Note: If the menu item is not visible on the Xiaomi device, we can unlock it by entering *#*#86583#*#* on the phone app's dial pad.
- Tap on Settings
- Tap on SIM cards & mobile networks
- Choose a SIM card (Dual SIM)
- Enable or disable Use VoLTE