ios – Website can not be loaded with mobile data – Wi-Fi is good

I'm using an iPhone 7 – loading a website while making a Wi-Fi connection. However, if you disable Wi-Fi and only use mobile data, the same Web site request "Safari can not open the page because the network connection was lost" appears.

I have cleared Safari browser data, in private mode trying the same result. According to reports, this also happens for Android.

How can I get the site to load only over the mobile data connection?