We can enable the mobile data on the secondary SIM card during a VoLTE call, which means that during VoLTE calls, the Xiaomi smartphone is connected to the mobile data on the secondary SIM card to ensure stable network connection.

Android 10 (MIUI 11.0)
Step 1:  Open the  Settings
Step 2:  Tap on  SIM cards & mobile networks
Step 3:  Enable or disable  Use mobile data during VoLTE calls on the secondary SIM
Step 4:  Confirm with  OK
  1. Open the Settings
  2. Tap on SIM cards & mobile networks
  3. Enable or disable Use mobile data during VoLTE calls on the secondary SIM
  4. Confirm with OK

Xiaomi Instructions
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