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With the function "Preferred network type" we can choose which network mode the Oppo-Smartphone should choose. By network mode we mean the 2G, 3G, 4G and the 5G network. Depending on the equipment of the device the options can differ.

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  Preferred network type
Step 5: Choose an  option
  1. Tap on Settings
  2. Tap on SIM card & mobile data
  3. Choose a SIM card (Dual SIM)
  4. Tap on Preferred network type
  5. Choose an option
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Oppo Instructions