| 31. | 803 is one of the original 86 North American Numbering Plan area codes assigned in 1947.
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| 32. | DDD was the term used when the North American Numbering Plan was implemented in the 1950s.
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| 33. | Under the original North American Numbering Plan of 1947, area code 503 covered all of Oregon.
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| 34. | In addition, the PRC numbering plan reserves space for Taiwan, but they are not currently used.
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| 35. | All 110 examples went into the numbering plan.
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| 36. | Though it was part of the original 1926 numbering plan, it was deleted within 10 years.
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| 37. | These systems use a closed telephone numbering plan.
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| 38. | Under the original North American Numbering Plan of 1947, area code 402 covered all of Nebraska.
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| 39. | The North American Numbering Plan decided that northwest Pennsylvania would receive the new code of 582.
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| 40. | For the telephone numbering plan context of 070 numbers see Telephone numbers in the United Kingdom.
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