New area code, who dis?The Big Apple is getting a new area code after a state board Thursday approved a long-gestating request by wireless companies for a fresh three-digit prefix to join existing codes.The newfangled number will be used in the Bronx, Brooklyn, Queens, Staten Island, and uptown Manhattan’s Marble Hill, which are covered by the 347, 718, 917 and 929 area codes — and are expected to soon run out of phone numbers.“There is a clear need for more telephone numbers as a result of economic growth and activity in the New York City metro areas, therefore, an additional area code is required,” said Rory M.Christian, chair of the state’s Public Service Commission, which approved the added code.“The new area code overlay will be able to address the expansion of telecommunication services which serves this region and to support future demand.”New Yorkers anxious to learn the new code, however, will have to hold.The North American Numbering Plan Administrator — the body that oversees phone numbers in 20 countries from the snowy wastes of Canada to the sunny shores of the Caribbean — will unveil the three-digit number in the coming months, officials said.The digits will be added to phone numbers once the 347, 718, 917 and 929 codes are exhausted, according to officials.Existing land and cellphone lines with the older codes will keep their current phone numbers.New York City has seen several new area codes pop up over recent decades, most recently in 2011, when 929 made its debut.The changes sometimes create minor headaches, as fictionally parodied in a 1999 “Seinfeld” episode in which Elaine Benes changes her number to the then-new 646 number and loses a prospective suitor in the process....