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2. 30 Scam Phone Numbers To Block and Area Codes To Avoid - AOL

   www.aol.com/finance/19-dangerous-scam-phone...

   Look at the area code: Start by comparing the phone number’s area code to the list of area codes you should never answer. If it’s on the list, there’s a good chance there’s a scammer on ...

3. Avoid Answering Calls from These Area Codes: Scam Phone ...

   www.aol.com/lifestyle/avoid-answering-calls-area...

   All it takes is a quick glance to know if the call is for real or not. The post Avoid Answering Calls from These Area Codes: Scam Phone Numbers Guide appeared first on Reader's Digest.

4. List of North American Numbering Plan area codes - Wikipedia

   en.wikipedia.org/wiki/List_of_North_American...

   Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.

5. Telephone numbering plan - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbering_plan

   In California and New York, because of the existence of both overlay area codes (where an area code must be dialed for every call) and non-overlay area codes (where an area code is dialed only for calls outside the subscriber's home area code), "permissive home area code dialing" of 1 + the area code within the same area code, even if no area ...

6. 555 (telephone number) - Wikipedia

   en.wikipedia.org/wiki/555_(telephone_number)

   The 555 exchange is not reserved in area codes used for toll-free phone numbers. This led to the video game The Last of Us accidentally including the number to a phone-sex operator. [11] The number "555-2368" (or 311-555-2368) is a carryover from the "EXchange 2368" ("Exchange CENTral") number common in telephone advertisements as early as the ...

7. North American Numbering Plan - Wikipedia

   en.wikipedia.org/wiki/North_American_Numbering_Plan

   In less than two years, area code 612 again exhausted its supply of telephone numbers, and necessitated a three-way division in 2000, creating the new area codes 763 and 952. The division again followed political boundaries, rather than rate center boundaries, resulting in additional split prefixes; a few numbers were transferred from 612 to ...

8. Seven-digit dialing - Wikipedia

   en.wikipedia.org/wiki/Seven-digit_dialing

   Area codes with interchangeable NXXs had mandatory 10-digit long-distance dialing in order to allow exchanges to distinguish between intra- and inter-area code calls. From 1988 to 1994, few area codes splits were possible due to the dwindling supply of area codes, so conservation measures became necessary.

9. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   The first automated toll-free telephone numbers were assigned with area code 800, created as inbound Wide Area Telephone Service (InWATS) in 1966 (U.S. intrastate) and 1967 (interstate). These terminated on special fixed-rate trunks which would accept calls from a specified calling area with either no limit or a specific maximum number of hours ...