Area code 700
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North American Area code 700 of the North American Numbering Plan (NANP) was introduced in 1983 to allow for presubscribing phone numbers to particular interexchange carriers [1]. Numbers in this area code are exclusive to the specific carrier, so that in the case of the wholly fictional 700-123-4567, where that number terminates could be one customer for AT&T, and an entirely different customer for each of MCI, Sprint, etc.
One useful number in area code 700 is (700)555-4141 to verify the carrier handling the long distance and international calls.
Area code 700 was assigned in 1983 on the eve of the introduction of long distance competition in the US. The intent was that interexchange carriers could use 700 numbers to implement new services quickly. When a 700 number is dialed, the local exchange carrier processing the call routes it to the presubscribed interexchange carrier, unless the caller has overridden presubscription by dialing 101XXXX before the number. Thus each interexchange carrier has access to all 7.92 million 700 numbers. 700 numbers are different from all other North American Numbering Plan numbers because the destinations are not unique, and, in fact, depend on the network the caller has selected.
One way to think of this is to think of it as an equivalent of 192.168.x.x - ip network range.
In October 2006 Vonage announced 1-700-WEATHER which provides current weather, forcasts, and severe weather warnings for any U.S. area from Accuweather.
