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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