Area Code 646 was created on 1st July 1999. The code is serving New York City Region, New York. New York is one of the Middle Atlantic States - United States. New area code i.e. 646 was created when area code 212 and code 917 were running out of possible combinations of phone numbers. Code 616 is used with landline numbers, mobile numbers and even with pagers.
Areas are split into further smaller areas and are assigned with different codes - so that to prevent the situation when combinations of phone number runs out. Adding a three digit area code with phone number provides more options for generating phone number combinations. Codes are allocated to areas so that to uniquely identify them. Phone numbers can be distinguished on basis of area code attached to them. Two area codes can have same combination of phone number - however two numbers can't have same area code.
Therefore if area runs out the combinations of phone number then the area is split or an overlay is added and new code is assigned to split or overlay area. However at the present time there are total seven area codes serving the region of New York City.
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