iPhone 13 mini Allow cellular data switching not working

[etaleb]

I exhausted the monthly data allowance on Provider 1 set as primary. I also have Airalo eSim turned on and allow cellular data switching on but iPhone data doesn't work. I switched to Airalo as primary and it works fine. How do I troubleshoot this? If a web browser can't load a page, iPhone should have a way to switch to Airalo but it's not doing that

Also, is there way to simply allow FaceTime Audio calls on cellular but not Video? That's what ran down my data allowance

Thanks

 

[etaleb]

Checking again on this - does switching only work when one providers network is completely unavailable versus the situation. I am in where the primary network is available, but it wouldn't pass any data because I have exhausted the monthly data limit.