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By default, the Samsung device automatically selects the best network, but once a network is selected manually, the "Select automatically" function must be reactivated to use the automatic network search.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Connections
Step 3: Tap on  Mobile networks
Step 4: Tap on  Network operators
Step 5: Enable  Select automatically
  1. Tap on Settings
  2. Tap on Connections
  3. Tap on Mobile networks
  4. Tap on Network operators
  5. Enable Select automatically
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Samsung Instructions