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 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  SIM card & mobile data
Step 3:  Choose desired  SIM card
Step 4:  Tap on  Preferred Network Type
Step 5:  Choose between  4G/3G/2G (Auto),   3G/2G (Auto)  and  2G Only
  1. Open the Settings
  2. Tap on SIM card & mobile data
  3. Choose desired SIM card
  4. Tap on Preferred Network Type
  5. Choose between 4G/3G/2G (Auto), 3G/2G (Auto) and 2G Only

Oppo Instructions
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