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2. E.164 - Wikipedia

   en.wikipedia.org/wiki/E.164

   E.164 is an international standard ( ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks . E.164 defines a general format for international telephone numbers.

3. Toll-free telephone number - Wikipedia

   en.wikipedia.org/wiki/Toll-free_telephone_number

   A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls. For the calling party, a call to a toll-free number from a landline is free of charge. A toll-free number is identified by a dialing prefix similar to an area code. The specific service access varies by country.

4. National conventions for writing telephone numbers - Wikipedia

   en.wikipedia.org/wiki/National_conventions_for...

   Belgian telephone numbers consist of three parts: First '0', secondly the "zone prefix" ( A) which has one or two digits for landlines and three digits for mobile phones, and thirdly the "subscriber's number" ( B ). Land lines always have nine digits. They are prefixed by a zero, followed by the zone prefix.

5. Telephone numbers in Australia - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Australia

   Mobile phones. Within Australia, mobile phone numbers begin with 04 or 05 – the Australian national trunk code 0, plus the mobile indicator 4 or 5 – followed by eight digits. This is generally written as 04XX XXX XXX within Australia, or as +61 4XX XXX XXX for an international audience.

6. Automatic number identification - Wikipedia

   en.wikipedia.org/wiki/Automatic_number...

   Automatic number identification (ANI) is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes. Automatic number identification was originally created by the American Telephone and Telegraph Company (AT&T) for long distance service in the Bell System , [3] [4 ...

7. 000 (emergency telephone number) - Wikipedia

   en.wikipedia.org/wiki/000_(emergency_telephone...

   000 Emergency, [1] also known as Triple Zero [1] or Triple 0, [2] and sometimes stylised Triple Zero (000), [1] is the primary national emergency telephone number in Australia [1] and Australian External Territories. The Emergency Call Service is operated by Telstra, and overseen by the Australian Communications and Media Authority (ACMA), [3 ...