5. In the Cellular option, you’ll find Modem Settings, which include Default Single SIM-1 and Multi SIM Management. Click on Default Single SIM-1 to access its specific settings.
6. After selecting Default Single SIM-1, you will see an option labeled Enable Modem Switch. If it is in the disabled state, click the switch to enable it.
7. Once you enable the Modem Settings, you will see additional settings as shown in the image below. In these settings, there is an option called APN Settings. Click on APN Settings and set the APN according to your preference. For example, you could enter internet.example.com.
Note - Device is set to "Auto Detect" by default; this means device will get APN automatically. But if you want to enter manually then, select respective telecom carrier name from the drop-down associated with your SIM and edit APN
8. The final step, after entering the APN, is to click the Submit button to save your changes.
9. Power-cycle/Reboot the device