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This means that to call another number within the same city or area, callers need to dial only a subset of the full telephone number. For example, in the NANP, only the seven-digit number may need to be dialed, but for calls outside the local numbering plan area, the full number including the area code is required.
The system was based on fixed-length numbers; a direct-dial long-distance call consisted of a three-digit area code and a seven-digit local number. Numbers in 2L-4N cities (such as Montréal and Toronto ) were systematically lengthened to seven digits in the 1950s, a few exchanges at a time, so that all local numbers were seven digits when ...
For example, a telephone number in North America consists of a three-digit area code, a three-digit central office code, and four digits for the line number. If the numbering plan area does not use an overlay plan with multiple area codes, or if the provider allows it for other technical reasons, seven-digit dialing may be permissible for calls ...
In case of exhaustion, various plans are discussed for expanding the numbering plan. One option is to add the digit 1 or 0 either at the beginning or at the end of the area code, or prefixing it to the seven-digit subscriber number. This would require eleven-digit dialing even for local calls between any two NANP numbers.
And because we humans tend to gravitate towards the same numbers (lucky number "7," for example, or numbers between 1 and 31 that correspond to special dates on the calendar, there's a possibility ...
Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.
Public resistance to the introduction of new area codes, whether as overlay complexes (which allowed customers to keep their existing numbers, but broke seven-digit local calling) or by area code splits (where the area code of existing numbers was changed), prompted the FCC and state commissions to introduce thousands-block number pooling, i.e. the allocation of number space in blocks of only ...
Ten-digit non-geographic numbers beginning with 1 are written 1X0Y BBB BBB, where X = 8 for toll free numbers, X = 3 for fixed-fee numbers and X = 9 for premium services. Six-digit non-geographic numbers are written 13 BB BB or 13B BBB; these are fixed-fee numbers. Seven-digit 180 BBBB numbers also exist. 'B's are sometimes written as letters.