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  1. The US uses a 10 digit phone numbering plan – area code + local number. Long distance calls require 1 before the number. Toll free numbers start with 800, 833, 844 etc. 011 is the US country code when calling from abroad. Major cities got the original low number area codes.

  2. A valid US phone number format typically consists of ten digits, with the first three digits representing the area code, the next three digits being the prefix, and the final four digits making up the line number.

  3. 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.

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  5. 1. Note the US International Exit Code (+1 / 001) 2. Obtain the US Country Code (1) 3. Check the US Area Code. 4. Double-Check the 7-Digit Local Phone Number. 5. Ensure the Correct US Phone Number Format. All US Area Codes. The Current US Phone Number Format. Telephone Area Codes. Local Telephone Exchanges. Separators. Toll-Free Numbering.

    • 205, 251, 256, 334
    • 480, 520, 602, 623, 928
    • 907
    • Area Codes
  6. Dec 28, 2020 · NANP phone numbers are assigned the country code (1) by the International Telecommunications Union ( ITU ). NANP numbers are ten-digits long. This includes a three-digit Numbering Plan Area (NPA) code — an area code followed by a seven-digit local number or subscriber number. The format is usually represented as: +1 NXX-NXX-XXXX.

  7. The telephone number consists of a three-digit central office (or exchange) code and a four-digit station number. The combination of an area code and the telephone number serves as a destination routing address in the public switched telephone network (PSTN).