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2. Toll-free telephone number - Wikipedia

   en.wikipedia.org/wiki/Toll-free_telephone_number

   Calling an 800-number is free of charge. Calling a 400-number incurs a local access charge. 800-numbers are accessible only to land-line subscribers, while 400-numbers are accessible to all land-line and mobile users. 800-toll-free numbers. 800 toll-free numbers are commonly called "800 免费电话".

3. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.

4. 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.

5. Caller ID spoofing - Wikipedia

   en.wikipedia.org/wiki/Caller_ID_spoofing

   Customers dial the number given to them by the company, their PIN, the destination number and the number they wish to appear as the caller ID. The call is bridged or transferred and arrives with the spoofed number chosen by the caller—thus tricking the called party.

6. Caller ID - Wikipedia

   en.wikipedia.org/wiki/Caller_ID

   Caller identification (Caller ID) is a telephone service, available in analog and digital telephone systems, including voice over IP (VoIP), that transmits a caller's telephone number to the called party's telephone equipment when the call is being set up.

7. Videos for 800 Number Voip

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     Avoid Answering Calls from These Area Codes: Scam Phone Numbers Guide
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     List of HTTP status codes - Wikipedia
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   See more videos for 800 Number Voip

8. 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 [1] in the U.S. and Google Workspace (G Suite by October 2020 [2]) customers in Canada, Denmark, France, the Netherlands, Portugal, Spain, Sweden, Switzerland, the United Kingdom and the contiguous United States. [3]