Jones has been used mainly in nickel and dime situations in his four seasons with the Dallas Cowboys, but he's also considered a good special teams player. That's been an emphasis for the Dolphins, who already have signed as free agents special teams stalwarts Keith Davis (also from Dallas), Boomer Grigsby (Kansas City), Sean Ryan (N.Y. Jets) and Charlie Anderson (Houston).
Jones also would battle for playing time at cornerback, although everybody is back from last year.
In his four seasons with the Cowboys, Jones had 78 tackles and two sacks. He also returned six kicks for 122 yards for the Cowboys last season, and the Dolphins could be in the market for a kickoff returner because Ted Ginn Jr. looked a lot better as a rookie returning punts than kickoffs.
Jones has the obvious connection with the Dolphins coaching staff from his time in Dallas, but he also has a prior relationship with Minnesota special teams coordinator Paul Ferraro, who was the defensive coordinator at Rutgers when Jones played there.