off deck
adj.— «T-Mobile and Cingular allow their subscribers to access features that are, in the obscure parlance of the wireless world, “off deck.” That means if users know where to look on the Web, they can sign up for content that is not discernibly featured on the phone.» —“More Fun for Your Mobile” by Brad Stone Newsweek Nov. 14, 2005. (source: Double-Tongued Dictionary)