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  2. Toll-free telephone number - Wikipedia


    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. Google Voice - Wikipedia


    Google Voice supports sending text messages to phone numbers in the U.S. and Canada, but users can receive text messages from anywhere in the world. VoIP services. Google Voice permits Voice Over IP (VoIP) as a beta from both the web and Android clients.

  4. Automatic number identification - Wikipedia


    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. Contact AOL customer support - AOL Help


    In addition to the support options listed above, paid members also have access to 24/7 phone support by calling 1-800-827-6364. Learn about the support options AOL offers and how to access help for your question or issue.

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


    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.

  7. Voice over IP - Wikipedia


    Voice over Internet Protocol ( VoIP [a] ), also called IP telephony, is a method and group of technologies for voice calls for the delivery of voice communication sessions over Internet Protocol (IP) networks, [2] such as the Internet. The broader terms Internet telephony, broadband telephony, and broadband phone service specifically refer to ...

  8. Mobile VoIP - Wikipedia


    Mobile VoIP. Mobile VoIP or simply mVoIP is an extension of mobility to a voice over IP network. Two types of communication are generally supported: cordless telephones using DECT or PCS protocols for short range or campus communications where all base stations are linked into the same LAN, and wider area communications using 3G or 4G protocols ...

  9. Telephone numbers in China - Wikipedia


    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

  10. Virtual number - Wikipedia


    A virtual number, also known as direct inward dialing (DID) or access numbers, is a telephone number without a directly associated telephone line. Usually, these numbers are programmed to forward incoming calls to one of the pre-set telephone numbers, chosen by the client: fixed, mobile or VoIP .

  11. Telephone numbering plan - Wikipedia


    Telephone numbering plan. A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. [1] Telephone numbers are the addresses of participants in a telephone network, reachable by a system of destination code routing.