If you select "Unanswered" from the query list at the mobile site, it does not work properly.
This "Unanswered" option is not present in SO.en, and will be displayed as a choice in MSE and SO.ja (and others).
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We marked this request status-declined because we're not prioritizing work on mobile views. We have been making more and more areas of the site mobile responsive and eventually (no timeline or official plan yet) plan to deprecate mobile views.