Hi Darock8,
Thanks for the post. As we understand it, you're seeing an alert that your device doesn't have internet access through Wi-Fi, and you want to know if you can set your device to cellular.
It sounds like you may want to start by trying the Wi-Fi Assist feature: About Wi-Fi Assist
With Wi-Fi Assist, you can stay connected to the Internet even if you have a poor Wi-Fi connection. For example, if you're using Safari with a poor Wi-Fi connection and a webpage doesn't load, Wi-Fi Assist will activate and automatically switch to cellular so that the webpage continues to load. You can use Wi-Fi Assist with most apps like Safari, Apple Music, Mail, Maps, and more.
When Wi-Fi Assist is activated, you'll see the cellular data icon in the status bar on your device.
Because you'll stay connected to the Internet over cellular when you have a poor Wi-Fi connection, you might use more cellular data. For most users, this should only be a small percentage higher than previous usage. If you have questions about your data usage, learn more about managing your cellular data or contact Apple Support."
You can turn this feature on or off by tapping Settings > Cellular, and then scrolling all the way down to the bottom to find Wi-Fi Assist.
We hope this answers your question.
Take care.