i.reddit.com actually works quite well on mobile, but I think this has even more risk of being shut down at a moment's notice so try not to mention it too much.
there's also ns.reddit.com that appears to be the same as old.reddit.com
That's basically an invalid locale prefix. Since ns is an invalid locale code or has no translations, it uses the default english. Reddit also used np.reddit.com which stood for non-participation. Basically there was subreddit CSS that disabled the voting buttons and comment dialog.