ALBANY, N.Y. (CBSNewYork) — A new area code will soon be coming to telephone customers in Suffolk County.

In order to ensure that the supply of telephone numbers does not run out, the new 934 area code will be added to the existing 631 area code for the Long Island county.

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The 934 area code will be overlaid on the same geographic area as the 631 area code, rather than replacing it, according to the New York State Public Service Commission. Beginning one year from Thursday, customers in the 631 area code requesting new service may be assigned a new 931 number.

The 934 numbers will be assigned to all telephone customers – including residential, business and wireless customers, the commission said.

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No one’s telephone number will change, but customers in Suffolk County will no longer be able to make calls with just seven digits. Beginning on Saturday, customers should begin dialing 1 and the area code before making calls even within the existing 631 area.

Effective June 15, 2016, the ability to place calls using seven digits will be eliminated.

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Calls to 911, as well as 211, 311, 411, 511, 611, 711 and 811 where applicable, may still be made with three digits.