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If a phone call is in progress and another call is received by the Xiaomi smartphone, a notification can be displayed. This is done both visually and acoustically.
In the phone settings, Call waiting can be switched on/off.

Note: When using Dual SIM, the call waiting function can be (de-)activated for each SIM card individually.

Android 11 | MIUI 12.0
Step 1: Tap on  Phone
Step 2: Open the  Menu
Step 3: Tap on  Settings
Step 4: Tap on  Calling accounts
Step 5: Tap on  Call waiting
Step 6: Choose a  SIM card   (Dual SIM)
Step 7: Enable or disable  Call waiting
  1. Tap on Phone
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Calling accounts
  5. Tap on Call waiting
  6. Choose a SIM card (Dual SIM)
  7. Enable or disable Call waiting
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Xiaomi Instructions