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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 entire 506-752 prefix is assigned to Aliant Telecom (NB) and serves Campobello Island, New Brunswick. [2] Campobello is a border community [3] and is a local call to Lubec, Maine, [4] in area code 207. The 207-733 prefix serves Lubec, split between FairPoint Communications and a pair of competitors using number pooling. [5]
As with a prefix code, the representation of a string as a concatenation of such words is unique. A bifix code is a set of words which is both a prefix and a suffix code. [8] An optimal prefix code is a prefix code with minimal average length. That is, assume an alphabet of n symbols with probabilities () for a prefix code C.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as "country dial-in codes", or historically "international subscriber dialing" (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
In 1982, Blue Shield merged with The Blue Cross Association to form the Blue Cross and Blue Shield Association (BCBS). [11] Prior to 1986, organizations administering BCBS were tax exempt under 501(c)(4) as social welfare plans. The Tax Reform Act of 1986 revoked the exemption, however, because the plans sold commercial-type insurance.
BCBS may refer to: The Basel Committee on Banking Supervision; The Blue Cross Blue Shield Association; Bishop Cotton Boys' School, in Bangalore, India; Bounds Check Bypass Store, a Spectre-NG class security vulnerability
The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [ 1 ] In 1950, the boundaries of the numbering plan area were redrawn to produce a division of the northern and central parts along a north–south ...
The area serviced by area codes 204, 431, and 584 in blue with neighbouring provinces, territories, and U.S. states in other colours. Area codes 204, 431, and 584 are telephone area codes in the North American Numbering Plan (NANP) for the Canadian province of Manitoba.