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By default, calls are made via SIM card 1, but the Samsung device can also be configured to use SIM card 2, or the device always makes a query before a call.

Note: The default SIM card for calls can also be changed via the status bar.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Connections
Step 3: Tap on  SIM card manager
Step 4: Tap on  Calls
Step 5: Choose  Ask always  or  SIM 1 / 2
  1. Tap on Settings
  2. Tap on Connections
  3. Tap on SIM card manager
  4. Tap on Calls
  5. Choose Ask always or SIM 1 / 2
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Samsung Instructions