Usually the Android 9 device connects to your phone company automatically. If this network is not available, you can deactivate the option and search for mobile networks yourself. 

Android 9
Step 1:  Open the  settings
Step 2:  Tap on  Network & Internet
Step 3:  Tap on  Mobile network
Step 4:  Tap on  Advanced
Step 5:  Activate or deactivate  Automatically select network
  1. Open the settings
  2. Tap on Network & Internet
  3. Tap on Mobile network
  4. Tap on Advanced
  5. Activate or deactivate Automatically select network

Android Instructions
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