 A telephone call, which for marketing purposes is claimed to be the first transcontinental telephone call, occurred on January 25, 1915, a day timed to coincide with the Panama&ndash;Pacific International Exposition celebrations. However, the transcontinental telephone line was first completed on June 17, 1914, and successfully first voice tested in July 1914. A 1998 U.S. postage stamp commemorates the completion of the line in 1914. 

 Left to Right: U.N. Bethell, Senior Vice-President Amercian Telephone &amp;amp; Telegraph Co., presiding; Hon.&amp;nbsp;George McAneny, President Board of Alderman, New York City;&amp;nbsp;John J. Carty, Chief Engineer, American Telephone &amp;amp; Telegraph Co.;&amp;nbsp;Alexander Graham Bell,&amp;nbsp;John Purroy Mitchel, Mayor of New York; C.E. Yost, President of Nebraska Telephone Co., Omaha; Hon. William A. Prendergast, Comptroller of the City of New York In front of Dr. Bell is the replica of his original telephone. In front of Mr. Bethell is the glass case containing a piece of the wire over which Dr. Bell and Mr. Watson carried on the first telephone conversation in the world.  

1st transcontinental telephone call