Cannot access the National lottery sie

It's loading fine for me. That error is coming from the site, suggesting it doesn't like something your browser is doing. Unfortunately we can't tell externally what that is.

I'd suggest testing with another browser to see if it loads. If so, try emptying the cache and cookies on the first one. Something it has stored may have changed, and that may be what the site is choking on now.

Did it last work slightly more than a week ago? I note they just refreshed their SSL cert on May 29th. I'm wondering if your phone doesn't support that cert, hence why both browsers don't work.