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  2. List of California area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_California_area_codes

    Numbering plan areas in California (blue) and border states. This map is clickable; click on any region shown to visit the page for those area codes. In 1947, the American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan and assigned the original North American area codes.

  3. Internet geolocation - Wikipedia

    en.wikipedia.org/wiki/Internet_geolocation

    IP address geolocation can be also used in fraud detection to match billing address postal code or area code. [11] Banks can prevent "phishing" attacks, money laundering and other security breaches by determining the user's location as part of the authentication process. Whois databases can also help verify IP addresses and registrants. [12]

  4. Area codes 909 and 840 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_909_and_840

    On July 23, 2019, the California Public Utilities Commission approved an all-services overlay for area code 909 with the new area code 840, effective February 23, 2021. A permissive dialing period was implemented from July 2020 to January 2021. While 840 numbers are issued to new subscribers, those with 909 numbers retain them. [4]

  5. Area codes 805 and 820 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_805_and_820

    Numbering plan areas in California (blue) and border states. This map is clickable; click on any region shown to visit the page for those area codes.Area code 805 is shown in red. Area codes 805 and 820 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of California.

  6. Telephony Application Programming Interface - Wikipedia

    en.wikipedia.org/wiki/Telephony_Application...

    Dialing rules are used to transform the canonical phone number into a dialable calling sequence for the modem, depending on the user's location. The dialing rules include variable-length dialing for area code, trunk access and international access prefixes, as well as central office access and calling card/credit card numbers. [1] [2]

  7. Area codes 310 and 424 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_310_and_424

    On December 31, 2005, customers began dialing 1 + area code + seven-digit number whenever a call is placed by a caller in the 310 or 424 area code to any other area code, including 310 to 424 or 424 to 310. After July 26, 2006, customers were required to use the new 1 + area code + seven-digit number dialing procedure for all calls, although ...

  8. Telephone number verification - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_verification

    A JavaScript function can check to see if a phone number is a valid format, i.e., is numeric, starts with a valid set of numbers ("0" for local, or an international dialing prefix followed by a valid country code) and is not too short to be a phone number. At first a JavaScript function is used to clear out any spacer characters.

  9. Internet Assigned Numbers Authority - Wikipedia

    en.wikipedia.org/wiki/Internet_Assigned_Numbers...

    The Internet Assigned Numbers Authority (IANA) is a standards organization that oversees global IP address allocation, autonomous system number allocation, root zone management in the Domain Name System (DNS), media types, and other Internet Protocol–related symbols and Internet numbers. [1] [2]