I believe they mean a cover as in a case that has a folding cover, not as in the external layer of the phone itself. So you effectively turn that otterbox-ish thing into a faraday cage that will enclose your phone.
I am not sure how I follow how that isn't completely negated as soon as you go to actually use the phone, though.
I am not sure how I follow how that isn't completely negated as soon as you go to actually use the phone, though.