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Call barring allows the Samsung device to bar different types of calls. For example, calls can be automatically rejected when roaming is enabled. Similarly, outgoing calls can be completely deactivated. When changing the call barring, the network password is required, which is included with the contract/tariff or can be obtained from the mobile operator. Usually the password is 0000. The following options are available for call barring

Android 11 | One UI 3.0
Step 1: Tap on  Phone
Step 2: Open the  Menu
Step 3: Tap on  Settings
Step 4: Tap on  Supplementary services
Step 5: Tap on  Call barring
Step 6: Choose  Voice calls  or  Video calls
Step 7: Turn On/Off an  Option
  1. Tap on Phone
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Supplementary services
  5. Tap on Call barring
  6. Choose Voice calls or Video calls
  7. Turn On/Off an Option
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Samsung Instructions