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This article iswritten inAmerican English, which has its own spelling conventions (center,color,defense,realize,traveled) and some terms may be different or absent from othervarieties of English. According to therelevant style guide, this should not be changed withoutbroad consensus.

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TelecommunicationsMid‑importance This article is within the scope ofWikiProject Telecommunications, a collaborative effort to improve the coverage ofTelecommunications on Wikipedia. If you would like to participate, please visit the project page, where you can jointhe discussion and see a list of open tasks.TelecommunicationsWikipedia:WikiProject TelecommunicationsTemplate:WikiProject TelecommunicationsTelecommunications Mid This article has been rated asMid-importance on theproject's importance scale.

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In anintegrated telephone numbering plan multiple countries share a single ITU country code. The North American Numbering Plan comprises 25 countries or dependent territories in North America and theCaribbeanusing country code 1. Similarly, in eastern Europe and Asia,world numbering zone 7with country code 7 comprisesRussia andKazakhstan with country code 7.

Perhaps "country code 1" and/or "NANP" should link somewhere, as "country code 7" does.--89.240.139.230 (talk)18:16, 17 May 2025 (UTC)[reply]

There's no explanation of the comparative advantages of each of these types of numbering plans.

If we're going to make this distinction, it seems like there ought to be a motivation for selecting one approach vs. the other.Fabrickator (talk)22:17, 23 August 2025 (UTC)[reply]

The distinction is not a Wikipedia invention, but rooted in historical developments, or perhaps rather, in historical decision making by the relevant engineering groups. Feel free to find their technical reasoning that informed their decisions. Good luck.kbrose (talk)04:22, 24 August 2025 (UTC)[reply]

"HAS variation, not ALLOWS" – so you're telling me that, if at any moment all the numbers happen to have the same length, it is no longer an open plan, even if there is nothing in the design to prevent lengths from varying again tomorrow?

Also, why is "variance" a better word here than "variation"?—Tamfang (talk)22:00, 25 August 2025 (UTC)[reply]

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