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2. N11 code - Wikipedia

   en.wikipedia.org/wiki/N11_code

   This U.S. road sign alerts highway users to the availability of 9-1-1 service.. An N11 code (pronounced Enn-one-one) is a three-digit dialing code used in abbreviated dialing in the North American Numbering Plan (NANP).

3. Premium-rate telephone number - Wikipedia

   en.wikipedia.org/wiki/Premium-rate_telephone_number

   Originally 09 numbers were designated as premium rate, with 0845 and 0870 numbers charged from landlines at rates that mirrored the cost of standard local and national phone calls respectively. Prior to this, a wide mix of prefixes was in use, from the well-recognized 0891 and 0898 prefixes to others such as 0331 and 0660.

4. Caller ID spoofing - Wikipedia

   en.wikipedia.org/wiki/Caller_ID_spoofing

   Example of caller ID spoofed via orange boxing; both the name and number are faked to reference leetspeak. Caller ID spoofing is a spoofing attack which causes the telephone network's Caller ID to indicate to the receiver of a call that the originator of the call is a station other than the true originating station.

5. Directory assistance - Wikipedia

   en.wikipedia.org/wiki/Directory_assistance

   Companies requested to have their toll-free number listed, and paid the providers each time their phone number was released to a toll-free directory-assistance caller. In 1999, AT&T applied for permission to discontinue this service, [2] but it remained active until the summer of 2020.

6. Telephone numbers in Romania - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Romania

   The dialling plan for mobile networks (numbers starting with 07) and new landline operators (numbers starting with 03) is closed; all subscriber numbers must be dialled in full. For landline numbers starting with 02, the dialling plan used to be open ; the trunk digit and area code could be omitted if the caller was in the same area code as the ...

7. Toll-free telephone number - Wikipedia

   en.wikipedia.org/wiki/Toll-free_telephone_number

   Many toll-free numbers are not available from cell phones (usually blocked by the cell phone provider rather than by the provider of the toll-free number, in an effort to prevent low-price competition from calling card providers). Some toll-free numbers are not available from phones listed by the owner of the number, including many payphones ...