No I don't own them, but I did get cellph0ne.com for the hell of it. 0 exact matches and 33 broad matches. Damn near bought cellph0nes.com. The name would actually be good for an end user in some areas, being that they will never make it to the search engines either way. Most small cell companies are nowhere to be found online, other than yelp, so might as well go with a good looking domain.
Now what I would do as an end user, is buy the name, promote the name all over the site as the web address, and then simply forward cellph0ne.com to another search friendly url.