23 years ago on October 1st, 1999
Area code 347 becomes active in NYC, adding to the area covered by 718 in the outer boroughs
11 years later, 929 would also be added to cover the same area as 347 and 718, which means that the current supply of numbers using those three area codes is expected to last until 2029 at the current rate of growth.
New York's most recent area code is 332, which was assigned to Manhattan in 2017. As of April 2020, NANPA, the organization in charge of assigning area codes, estimates that New York City's available phone numbers will begin to be completely depleted by 2030, although those estimates have been increasing as fewer new numbers have been needed in recent years. With the shift toward mobile phones and the portability of numbers, New York area codes can now travel across the country, bringing along the legacy of having once been assigned to someone living in New York City.