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Or an "old".

You can use "old.reddit.com" instead of "www.reddit.com", but you might get an SSL error if you try to use "https://www.old.reddit.com/...".

I did not know the i.reddit.com, I did know the old one but it is not of much use on a mobile phone

there's a firefox plugin for that :)

I made an (experimental) extension for Firefox that lets you choose which version of reddit you want to use