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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".
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.
Wide Area Telephone Service ( WATS) was a flat-rate long-distance service for customer dial-type telecommunications in the service areas of the North American Numbering Plan (NANP). The service was between a given customer phone (also known as a "station") and stations within specified geographic rate areas, employing a single telephone line ...
The toll-free telephone numbers in NPA 800, 888, 877, 866, 855, 844, and 833 have been portable through the RespOrg system since 1993. Toll charges. Telephone calls between countries and territories of the NANP are not typically charged at domestic rates.
Automatic number identification (ANI) is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes.
In the U.S., directory assistance for companies with toll-free "800 numbers" (with area codes 800, 833, 844, 855, 866, 877, and 888) was available from toll-free directory assistance, reachable by dialing 1-800-555-1212, for many decades until it was discontinued in 2020.
A telephone number serves as an address for switching telephone calls using a system of destination code routing. Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange.
A RespOrg, or responsible organization, is a company that maintains the registration for individual toll-free telephone numbers In the North American Numbering Plan by means of the distributed Service Management System/800 database.
Telephone numbers of the form 0600-xxx-xxxx and 0609-xxx-xxxx are premium rate numbers. The 0609 series is for entertainment (fixed rate), while 0600 is for services (the rate depends on the particular number).
Toll-free number portability (Canada, US, New Zealand) or freephone number portability (Australia, UK) allows the subscriber of a freephone number to switch providers while retaining the same number for incoming calls.