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Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, or 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.
The North American Numbering Plan ... area code 387 is reserved as a fifth code for the region; 417: ... 855: toll-free telephone service:
The North American Numbering Plan ... The only service-specific overlay in the NANP was area code 917 ... 866, 855, 844, and 833 have been portable through the ...
The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union. Original North American area codes
NANP members are assigned three-digit numbering plan area (NPA) codes under the common country code 1, shown in the format 1 (NPA). 1 North American Numbering Plan; 1 – United States, including United States territories: 1 (340) – United States Virgin Islands; 1 (670) – Northern Mariana Islands; 1 (671) – Guam; 1 (684) – American Samoa
The INC also reserved the remaining 8YY [sic] (877, 866, ..., 822) area codes for future toll-free services. On March 1, 1996, the 888 code was opened. On April 5, 1998, the 877 code was opened. On July 29, 2000, the 866 code was opened. On October 10, 2010, the 855 code was opened.
The North American Numbering Plan is based on a ten-digit telephone number assigned to each telephone in the telephone network. The number is composed of the three-digit numbering plan area code, a three-digit central office code, and a four-digit station or line number. Certain rules govern the numerical format of each part.
In California and New York, because of the existence of both overlay area codes (where an area code must be dialed for every call) and non-overlay area codes (where an area code is dialed only for calls outside the subscriber's home area code), "permissive home area code dialing" of 1 + the area code within the same area code, even if no area ...