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  1. Mar 1, 2024 · A typical US phone number consists of a total of 10 digits, which include the area code, exchange code, and line number. If you are calling the US from outside, use the following format: your country’s exit code + 1 + area code + local phone number.

  2. Apr 8, 2024 · A. Format and structure. Traditional landline phone numbers in the US typically consist of 10 digits. These numbers are structured in three parts: the area code, the central office code, and the local exchange code. For example, in the number (123) 456-7890, the area code is 123, the central office code is 456, and the local exchange code is 7890.

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  4. The ten digits used for local calls (AAA XXX XXXX or 0AA XXX XXXX) consist of a 3-digit area/type code (the first digit in the area/type code is a trunk prefix) followed by seven digits. All area codes, including mobile numbers, start with a "0" (trunk prefix) for domestic calls.

  5. The standard US phone number format consists of 10 digits made up of a 3-digit area code and a 7-digit local number. This format applies to US Phone Number in the United States, whether they are regular landlines, cell phones, or Voice over IP (VoIP) numbers.

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  6. Apr 3, 2024 · XXX is the three-digit area code. YYY is the three-digit central office code (exchange code) ZZZZ is the four-digit local number. In this example: The area code is “555.”. The central office code (exchange code) is “123.”. The local number is “4567.”. Here’s an example of a United States phone number: (555) 123-4567.

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  7. Feb 19, 2024 · Closed numbering plans contain a fixed number of digits for each telephone number. For instance, countries under the NANP adhere to a 10-digit format. Conversely, open numbering plans in countries like Mexico, Germany, and Japan allow variable numbers of digits, offering flexibility but potentially increasing complexity for users.

  8. It is an open numbering plan, however, imposing a maximum length of 15 digits to telephone numbers. The standard defines a country code for each member region which is prefixed to each national telephone number for international destination routing .

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