The network mode is the choice between 2G, 3G or 4G (LTE). Users can instruct the Samsung device to use only the 2G network, for example. 5G may also be available depending on the model and equipment.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Connections
Step 3:  Tap on  Mobile networks
Step 4:  Tap on  Network mode
Step 5:  Choose between  LTE/3G/2G ,  3G/2G ,  3G only  and  2G only
  1. Open the Settings
  2. Tap on Connections
  3. Tap on Mobile networks
  4. Tap on Network mode
  5. Choose between LTE/3G/2G, 3G/2G, 3G only and 2G only

Samsung Instructions