The APN is not configured or the connection cannot be established
In most cases the SIM automatically configures the APN. If the Internet connection is not established after inserting a valid SIM, go to Mobile Network > Profile Management and verify the APN field matches your operator’s access point name.
Authentication Type: Auto (recommended).
IP Type: IPv4V6 (dual stack, recommended).
Username and Password: leave blank unless your operator explicitly requires them.
Click Apply to save.
Tips: Go to Mobile Network > Network Setting and make sure the Network Mode is set to Auto (5G Pref) for automatic connection to the best available network.