There is disclosed an apparatus for remote opening of doors or gates of at least a building (A, A1 . . . An). The apparatus comprises a unit (B, B 1 . . . Bn) located in the building (A, A1 . . . An) and accessible from a plurality of external terminals (C1 . . . Cn) provided with a GSM module; the unit (B, B1 . . . Bn) is connected to electromechanical means (50) suitable for opening and closing said doors or gates and comprises a database (2) containing the list of the telephone numbers of said plurality of external terminals (C1 . . . Cn), a GSM interface (3) for connecting to the external terminals (C1 . . . Cn) and means (4) for managing said interface (3) and said database (2). The managing means (4) is interrogatable by the external terminals (C1 . . . Cn) and is suitable for commanding the electromechanical means (50) for opening gates or doors if the telephone number of the interrogating external terminal is on the list of telephone numbers of the external terminals (C1 . . . Cn) of the database.