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The first nationwide telephone numbering plan of 1947 divided Ohio into four numbering plan areas (NPAs), one each for a quadrant of the state: 216, 419, 513, and 614. In 1996, 330 and 937 were added by splitting existing NPAs. In 1997, 440 and 740 were added in additional area code splits. In 2000, 234, and in 2002, 567 were added as overlays ...
Area codes 614 and 380 are telephone area codes in the North American Numbering Plan (NANP) for all or part of four counties in central Ohio, surrounding and including the state capital of Columbus. Area code 614 is one of the original area codes assigned for Ohio in 1947, while area code 380 is an overlay code covering the same territory.
The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits.
In telecommunications, a plant test number is a telephone number reserved for use by telephone installers or other workers to test an individual telephone line. Test numbers are typically unlisted. The North American Numbering Plan (NANP) reserves the exchange (central office) prefixes 958 and 959 for plant testing. [1] Central office code 958 ...
1-5-7-1 is a family of calling features in the United Kingdom, for residential and business telephone lines and for mobile telephones, that are provided by BT Group and several other telephone service providers. The family is named after the telephone number 1571, the special service number that is used to access it.
A Phone of Our Own: the Deaf Insurrection Against Ma Bell. Washington, D.C.: Gallaudet University Press. ISBN 978-1-56368-090-8. OCLC 59576008. Strauss, Karen Peltz (2006). A New Civil Right: Telecommunications Equality for Deaf and Hard of Hearing Americans. Washington, D.C.: Gallaudet University Press. ISBN 978-1-56368-291-9. OCLC 62393257
A typical lineman's handset integrates an earpiece, a mouthpiece, a dialing interface, and a set of test leads for connecting to the telephone circuit. Originally, lineman's handsets featured a rotary dial , but modern sets use some variant of the standard 12-button DTMF keypad and also employ an amplifier for speaker use.
Area code 740 was established by an area code split of area code 614 on November 8, 1997. [1] By the end of 2013, exhaust studies indicated that the 740 area code would run out of telephone numbers sometime in 2015. The Public Utilities Commission of Ohio chose a relief plan by implementing an overlay with new area code 220, effective April 22 ...
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