Re: NANP Number Lengths

I've been told by a UK carier that eleven digit numbers beginning 09

> are in use in Canada and diallable by the public - 1 09x xxx xxxx y.

Categorically false. Within the US and Canada, any customer dialed string beginning with 10 is a carrier selection code, and none of those begins with 109. Furthermore, any customer-dialable number (other than short codes) consists of a 3-digit area code followed by exactly 7 digits. The sequence is:

*XX service codes, optionally dialed as 11XX (esp. on rotary phones) 101XXXX carrier selection code 1 or 0 trunk code NXX area code (always [2-9] [0-8] [0-9] ) NXX-XXXX local number

Not all of the elements are used on every call, and local rules vary as to whether it is necessary to dial 1+NPA or just NPA or neither, for a given calling destination. In particular, about 2/3 of the US and all of Canada use 1+ to indicate a toll call, but areas such as California and New York use it only to indicate that the area code follows, without respect to local/toll distinctions.

Also, no area codes for any customer-dialable number either begin with '0' nor have '9' as the middle digit. The N9X range is reserved for transition to longer numbers, and the 0XX range will not be available at least until all calls within the NANP must be dialed with the full NSN.

As far as I'm aware, although the 09 number space /is/ used, it is > only for internal network routing purposes and even then will still > only contain ten digits.

I'm much less of an expert on this area of numbering, but to my knowledge, *all* internal routing and billing numbers are fixed ten digits. I once had a calling card attached to a non-dialable billing number of the form (NXX) 090-XXXX.

Linc Madison * San Francisco, California * Telecom at Linc Mad d0t c0m URL: <

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> * North American Area Codes & Splits Read my political blog, "The Third Path" US, California, and Washington State laws apply to LINCMAD.COM e-mail.

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Linc Madison
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