You might be missing APN settings, and you can try to download those settings while connected to Wi-Fi from Settings -> Network & internet -> Internet settings -> Accept -> Restart the phone after the settings are successfully downloaded and installed.
If this doesn't work for you, contact your network provider and ask for assistance on how to set up those settings manually.
Feel free to kudo this post or mark it as solution so that other users facing the same issue can find it
Disclaimer: Moderators are not affiliated with or work for Sony Mobile, their posts represent their own opinions and views. Click here to find out more about the different roles in the community.