Jones was signed by the 49ers on Tuesday.
The 49ers bring in Jones to bolster their defensive line after Arik Armstead (shoulder) was placed on injured reserve. Jones has been around the league since he was drafted in 2013 but most recently played for the Dolphins, recording seven tackles in seven games before being cut on Nov. 7. The 26-year-old will compete for reps with backup defensive end Ronald Blair behind new starter DeForest Buckner.