The New York Jets signed Simms as an undrafted free agent out of Tennessee in 2012. He spent his first three NFL seasons in New York.
49ers head coach Kyle Shanahan has familiarity with Simms, who joined the Falcons in 2015 when Shanahan was the offensive coordinator there. Simms spent two seasons on Atlanta's practice squad before being released with an injury settlement before last season.
Simms joins Tom Savage, Kellen Clemens, and T.J. Yates in working out for the 49ers. The team had hoped to work out former Miami Dolphins quarterback Matt Moore as well but he declined, according to his agent.
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