Which model an iOS version device?
Are you connected towifi?
To learn how to 'Connect to Wi-Fi on your iPhone, iPad, or iPod touch', click here --> https://support.apple.com/HT202639
If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network,
click here --> https://support.apple.com/HT204051
VPN issue --> https://discussions.apple.com/thread/253158550
Click on a link below for full instructions about how to update with wi-fi or 5G (if using 5g then see: Use 5G with your iPhone https://support.apple.com/HT211828 ), or using a computer if you have storage or connectivity issues.
Update your iPhone, iPad, or iPod touch. Click here --> https://support.apple.com/HT204204
Or this video:
"How to update your iPhone or iPad" click here --> https://youtu.be/csJAEyvvruY