When a area code split takes place, some of the prefixes remain with the old area code and some move to the new area code. Where can that information be found?

When a new area code is assigned, NANPA issues a press release that provides an overview of how the new code will be used. If the new area code will be used for a split, and if the list of prefixes is available, it will be included in the NANPA press release. Check the "Press Releases" section of the web site. Details of each split, once finalized, are included in a planning letter on our web site. The planning letter typically contains prefix lists, maps, dialing plans, and key dates. Check the "Planning Letters" section of the web site.

With all of the area code splits that happen every year, how can phone number databases be kept up to date?

Some companies have aggregated split-related area code and prefix information to assist in updating phone number databases. One example is Telcordia's ACSED product, described at www.trainfo.com.

Who publishes LATA maps?

LATA maps are available from several vendors. One way to identify possible sources is to search the internet using the key words "LATA maps".

What is area code 700 used for?

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.

What are area codes 880, 881, and 882 used for?

These codes provide a way to extend toll-free calling beyond the borders of the country in which the party paying for the calls resides. These codes have been used primarily to allow Caribbean callers to reach toll free numbers in the US. With this arrangement, the caller pays for the international segment of the call (to the US gateway), and the called party pays for the remainder. In theory, this concept can be implemented between any of the countries sharing the NANP.

How does NANPA decide who is entitled to the assignment of a NANP numbering resource; e.g., central office code, carrier identification code?