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 10 (One UI 2.0)
Step 1:  Open the  Phone App
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 between  Voice call  and  Video call
Step 7:  Enable or disable desired  Option
Step 8:  Enter  Password  and confirm with  OK
  1. Open the Phone App
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Supplementary services
  5. Tap on Call barring
  6. Choose between Voice call and Video call
  7. Enable or disable desired Option
  8. Enter Password and confirm with OK

Samsung Instructions
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