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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.

Android 11 | MIUI 12.0
Step 1: Tap on  Settings
Step 2: Tap on  SIM cards & mobile networks
Step 3: Choose a  SIM card   (Dual SIM)
Step 4: Enable or disable  Use VoLTE
  1. Tap on Settings
  2. Tap on SIM cards & mobile networks
  3. Choose a SIM card (Dual SIM)
  4. Enable or disable Use VoLTE
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Xiaomi Instructions