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2. Somos, Inc. - Wikipedia

   en.wikipedia.org/wiki/Somos,_Inc.

   Toll-free telephone service is a telecommunication service in which subscribers are assigned telephone number in NPAs 800, 888, 877, 866, 855, 844, and 833. Calls to these numbers incur no toll charges for callers. The American Telephone & Telegraph Company (AT&T) first introduced 800 toll-free service in 1967.

3. iNum Initiative - Wikipedia

   en.wikipedia.org/wiki/INum_Initiative

   iNum Initiative. The iNum ( i nternational num ber) initiative was a project by Voxbone to create a global dial code for Voice over IP communications. Voxbone is a Belgian company specializing in wholesale telephone numbers for VoIP applications. The International Telecommunication Union (ITU) allocated a portion of the non-geographic " country ...

4. 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.

5. 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

6. Local number portability - Wikipedia

   en.wikipedia.org/wiki/Local_number_portability

   Local number portability (LNP) for fixed lines, and full mobile number portability (FMNP) for mobile phone lines, refers to the ability of a "customer of record" of an existing fixed-line or mobile telephone number assigned by a local exchange carrier (LEC) to reassign the number to another carrier ("service provider portability"), move it to another location ("geographic portability"), or ...

7. WhatsApp - Wikipedia

   en.wikipedia.org/wiki/WhatsApp

   WhatsApp (officially WhatsApp Messenger) is an instant messaging (IM) and voice-over-IP (VoIP) service owned by technology conglomerate Meta. [14] It allows users to send text, voice messages and video messages, [15] make voice and video calls, and share images, documents, user locations, and other content.