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  1. Feb 28, 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. In the USA, phone numbers are formatted with a three-digit area code followed by a seven-digit local number. Here’s an example showing how to add the US country code to a phone number: Area code – Phone number or 917–444-7288. When calling from abroad to the US, you need to use the international code.

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  4. The current telephone numbering system in the US uses area codes as the first 3 digits of a phone number. Area codes are also known as Numbering Plan Areas (NPAs). These 3-digit prefixes correspond to specific geographic regions and allow routing calls to the correct destination.

    • 205, 251, 256, 334
    • 480, 520, 602, 623, 928
    • 907
    • Area Codes
  5. Apr 8, 2024 · 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.

  6. All area codes begin with the number 0. The operator code for fixed (landline) numbers is "y". "zzzzzz" denotes the primary telephone number, which has six digits. Mobile numbers start with the mobile operator code (which begins from 07X, followed by seven digits for the main telephone number).

  7. A telephone number serves as an address for switching telephone calls using a system of destination code routing. Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange.

  8. 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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