For Xiaomi smartphones with two SIM cards, we can define a default SIM card for mobile data.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  SIM cards & mobile networks
Step 3:  Choose a  SIM card  for mobile data  (Dual SIM)
  1. Open the Settings
  2. Tap on SIM cards & mobile networks
  3. Choose a SIM card for mobile data (Dual SIM)

Xiaomi Instructions
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