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area code 670
The area code 670 is the local telephone area code for the U.S. Commonwealth of the Northern Mariana Islands (CNMI). It was created on July 1, 1997 and replaced the previous International Telecommunication Union country code 670, which is now used by East Timor.
==History==
Although the Northern Mariana Islands (NMI) became a commonwealth in 1978 and the United States assumed sovereignty in 1986, calling between the CNMI and the rest of the United States remained an international call (011-670-XXX-XXXX). As international calling rates began to fall in the more competitive destination countries during the 1990s, it became a considerable financial burden for people calling between the U.S. Mainland and the CNMI.
After the CNMI was added to the North American Numbering Plan, the U.S. Federal Communications Commission (FCC) regulated calls to and from the CNMI as "domestic", hence dramatically lowering the cost of these telephone calls. This change also opened up national toll-free numbers to callers from the CNMI, which became very popular with the advent of pre-paid phone cards.
However, since no mobile telephone carriers in the U.S. are present in the CNMI, cellular calls to the CNMI are not considered "domestic" or within the definition of "nationwide long distance".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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