You must dial your 7-digit phone number if you are a New York local caller. A 10-digit dialing code phone number is used for callers outside of New York but within the United States. Use the 11-digit dialing format for international calls, and dial the 760 area code. (AP) — NEW YORK (AP) — A sixth area code is coming to New York City. The area code 929 will be assigned to some landlines and cell phones in the outer boroughs starting April 16. The city's existing area codes of 212, 718, 917, 646, and 347 will be joined by this code.