Soto has played for four teams in 11 major league seasons. The former Chicago Cubs backstop spent last season on the other side of town with the White Sox, batting .219 with nine homers and 21 RBIs in 78 games.
A solid defender, Soto also has played for Texas and Oakland. He was the National League Rookie of the Year and an All-Star in 2008 with the Cubs.
Soto will team with Carlos Perez behind the plate for Los Angeles. Perez shared the job last season with Iannetta, whose offensive production plummeted in his fourth season with the Angels.