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There had been a lot of tiny telegraph delivery businesses in the United States in the 19th century. In 1874, 57 district telegraph delivery companies affiliated and became "American District Telegraph". With the improve in phone use in the late 19th century, adt security systems company gradually declined in popularity. ADT attempted branching out and building their signaling organization even though even now sustaining their telegraph company as primary earnings source. ADT integrated into Western Union in 1901. ADT separated its messenger company from its main signaling organization at this time. In 1909, Western Union and ADT arrived under the manage of AT&T. home security system commenced to grow into new places this sort of as fireplace alarms and burglar alarms in between 1910 and 1930, but was kept separate from AT&T's Holmes alarm business. adt grew to become a publicly owned organization in the 1960s.

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