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Contents
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(Top)
1
History
Toggle History subsection
1.1
Foreign expansion
2
Administration
3
Numbering plan
Toggle Numbering plan subsection
3.1
Numbering plan areas and central offices
3.2
Initial numbering system
3.3
Dialing procedures
3.4
All-number calling
3.5
Interchangeable central office codes
3.6
Interchangeable NPA codes
3.7
Modern plan
3.8
Telephone number formatting
4
Non-geographic services
5
Cellular mobile services
6
Growth
Toggle Growth subsection
6.1
Growth problems
6.2
Number conservation
6.3
New area codes outside the contiguous United States and Canada
6.4
Future numbering plan expansion
7
Dialing procedures
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7.1
Special numbers and codes
8
International dialing
9
Number portability
10
Toll charges
11
Countries and territories
12
Alphabetic mnemonic system
13
Fictional telephone numbers
14
See also
15
References
16
External links
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North American Numbering Plan
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