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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.
The definition of "local" or "long distance" calling (and the corresponding pricing) is largely a regulatory construct, by which every point outside an arbitrary group of exchange boundaries is charged at a higher "trunk call" or "toll call" rate.
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.
RespOrgs were established in the U.S. in 1993 and Canada in 1994 to provide toll free number portability using the Service Management System ( SMS/800) database. Calls from Canada and the U.S., intrastate and interstate, could terminate at the same 1‑800 number, even via different carriers.
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.
Some mobile phone network operators describe their add-ons as giving 'unlimited' minutes for making international calls. However, the official Fair Usage Policy tends to limit the maximum allowable talk time at 3,000 minutes per month.
The service provides to low-income eligible people a free phone, [1] [2] free monthly data, unlimited texting, and free monthly minutes. Assurance Wireless users do not receive a bill, are not required to sign a contract, and do not pay activation fees or recurring fees. [3]
800 number portability means that toll-free numbers are no longer associated with a particular telephone carrier such as AT&T or MCI. 800 subscribers can switch to another carrier without changing their toll-free number.
A conference call (sometimes called an audio teleconference or ATC) is a telephone call in which someone talks to several people at the same time. The conference call may be designed to allow the called party to participate during the call or set up so that the called party merely listens into the call and cannot speak.