Where is telephone country code 718?

New York City area codes:

Area code 212 and overlay code 646 serve Manhattan.

Area code 718 and overlay codes 347 and 929 serve the other four boroughs (Brooklyn, Queens, Bronx, and Staten Island).

Area code 917 serves all five boroughs.

The country code for the USA, along with Canada and certain nearby islands, is +1.

(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)