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  2. Google Voice - Wikipedia

    en.wikipedia.org/wiki/Google_Voice

    Google Voice is a telephone service that provides a U.S. phone number to Google Account customers [4] in the U.S. and Google Workspace (G Suite by October 2020 [5]) customers in Canada, Denmark, France, the Netherlands, Portugal, Spain, Sweden, Switzerland, the United Kingdom and the contiguous United States. [6]

  3. Toll-free number portability - Wikipedia

    en.wikipedia.org/wiki/Toll-free_number_portability

    The TNAS System is a database for co-ordination of allocation and porting of toll-free numbers and is used by nine carriers. [5] A client may switch service providers, or a service provider switch host carriers, without a change in the published toll-free number. [6]

  4. 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 ...

  5. Porting Authorisation Code - Wikipedia

    en.wikipedia.org/wiki/Porting_Authorisation_Code

    Porting Authorization Code (PAC) is a unique identifier (normally 9 characters long and in the format "ABC123456") used by some mobile network operators to facilitate mobile number portability (MNP). This allows users to retain their mobile telephone number when switching operators.

  6. Mobile number portability - Wikipedia

    en.wikipedia.org/wiki/Mobile_number_portability

    Free Customers are not able to port between prepaid and postpaid options. Vendor for database installation is Syniverse Technologies [47] South Korea: 2004.07.12 [48] [44] Taiwan: 2005.10.13 1 TWD 112 [49] [50] Thailand: 2010.12.15 2 Free Number Portability Clearinghouse services were previously handled by iconectiv. 2 days can be just working ...

  7. Direct inward dial - Wikipedia

    en.wikipedia.org/wiki/Direct_inward_dial

    For voice-over-IP resellers, some specialized CLECs (for local numbers) or interexchange carriers (for toll-free numbers) will deliver blocks of direct inward dial calls already converted to Session Initiation Protocol (SIP) or common VoIP formats.