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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