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By default the Oppo-Smartphone automatically searches for a network, but once the Automatic search has been deactivated to manually select the network, it can be reactivated in the settings.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  SIM card & mobile data
Step 3: Choose a  SIM card   (Dual SIM)
Step 4: Tap on  Carrier
Step 5: Turn On  Auto select
  1. Tap on Settings
  2. Tap on SIM card & mobile data
  3. Choose a SIM card (Dual SIM)
  4. Tap on Carrier
  5. Turn On Auto select
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Oppo Instructions