The SM.84 proved to be less maneuverable, which crews disliked, and didn't succeed in replacing the S.M.79. Attempts were made to make it a torpedo plane but that failed.
In February 1941 the first bomber group received the SM.84 for operations.
The 282a Squadriglia was based in Sicily and attacked convoys from November 1941 to August 1942.
The 4° and 25° Gruppi B.T. that were based in Sicily were used to attack Malta.
After the Surrender
Some SM.84s were captured by the Germans but did few operations.
Ten SM.84s were used by the Allies in a transportation group.
After World War II
Some SM.84s were used as transports until 1948.