Much, *much* worse: many sites (FireDog was very bad about this) detect that you're on a mobile device *and redirect you to the mobile *HOMEPAGE** (no matter what actual internal page you were trying to go to.
The proper approach to this is:
1) detect the user's browser. If known non-mobile, stop.
2) If known mobile, display the page using a mobile style sheet, if possible.
3) On your mobile stylesheet, provide a link to allow the user to switch back to the non-mobile style, and a second link to set a cookie to make the non-mobile behaviour the default for that site.
You shouldn't do it with redirects, cause perhaps the user wants to share that story with friends, and those *friends* won't be on a mobile device -- some mobile sites work poorly or not at all on desktop browsers.
(While I'm at it: hint: putting the title in the URL is also wildly antisocial design. If you must do so, do it as a (deletable) suffix to the articleID.)