Area code and exchange code is assigned to every constituent of city in the United States. The area and exchange codes of the telephone can be used to find information about a region. Area code 401 and exchange code 705 is assigned to Dallas. The latitude and longitude corresponding to 32.80806 and -96.86909 can be used to find an area on the map. Blue Licenses Holding, Llcoperates most of the land lines in United States.