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2. Telephone numbers in Singapore - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Singapore

   Special service numbers. 800 ... VoIP services, such as Zone 1511, use prefixes in the 15xx range. For example, to call a number in London using Zone 1511, a ...

3. Caller ID spoofing - Wikipedia

   en.wikipedia.org/wiki/Caller_ID_spoofing

   Caller ID spoofing. 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. This can lead to a display showing a phone number different from that of the telephone from which the call was placed.

4. Telephone numbers in Poland - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Poland

   800 xxx xxx Other numbers [ edit ] Paging services 64 x 000 64 x xxx xxx Carrier Selection Code 10xx 10xxx UTR VSAT, Tekstofon, Fixed SMS 802 xxx xxx UAN (universal number) 804 xxx xxx VPN 806 xxx xxx VCC 808 xxx xxx VoIP 39x xxx xxx NDSI – dialed access to data networks incl. Internet 20 xx xx

5. Premium-rate telephone number - Wikipedia

   en.wikipedia.org/wiki/Premium-rate_telephone_number

   Numbers starting with 900, 906, 909 and 976 are premium rate numbers. Other numbers beginning with "9" are allocated to certain organizations, such as 972 (Czech railways), 973 (Ministry of Defense), 974 (Ministry of Interior), 95x (other Ministries, government organizations, certain commercial subjects), 910 (VoIP nongeographic nomadic numbers).

6. Telephone numbers in China - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_China

   179xx + target number followed – VoIP (e.g. 17901-133-0000-0000, 1790 for China Telecom, 1791 for China Unicom, and 1795 for China Mobile) 400 xxx xxxx , 800 xxx xxxx – business numbers

7. 800 (number) - Wikipedia

   en.wikipedia.org/wiki/800_(number)

   800 (number) 800 ( eight hundred) is the natural number following 799 and preceding 801 . It is the sum of four consecutive primes (193 + 197 + 199 + 211). It is a Harshad number, an Achilles number and the area of a square with diagonal 40. [1]