Smith, who was released by the Toronto Blue Jays in March after signing with them as a minor league free agent, has pitched in the majors with the Oakland A's and Colorado Rockies. In 40 major league games, Smith has a mark of 8-18 with a 4.51 ERA.
Last season, Smith split his time with Arkansas (AA) and Salt Lake (AAA) in the Anaheim Angels organization, posting a combined record of 11-11 with a 4.05 ERA.
To make room for Smith, the Phillies released outfielder Ron Welty. The Phillies sent pitcher Julio Rodriguez to Baltimore this spring to acquire Welty, who was hitting just 1-3-.162/.220/.243 in 15 games with the Fightins.
If he pitches well, Smith could put himself into the discussion to either move up to Triple-A Lehigh Valley when Roy Halladay goes on the DL or potentially take Halladay's spot in the rotation, but that would be a long-shot.