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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.
A Universal International Freephone Number (UIFN) is a worldwide toll-free "800 number" issued by the International Telecommunication Union. Like the 800 area code issued for the North American Numbering Plan in the United States and Canada and 0800 numbers in many other countries, the call is free for the caller while the receiver pays the ...
NIST holds patents on behalf of the Federal government of the United States, with at least one of them being custodial to protect public domain use, such as one for a Chip-scale atomic clock, developed by a NIST team as part of a DARPA competition. Controversy regarding NIST standard SP 800-90
The National Do Not Call Registry is a database maintained by the United States federal government, listing the telephone numbers of individuals and families who have requested that telemarketers not contact them.
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.
FISMA defines a framework for managing information security that must be followed for all information systems used or operated by a U.S. federal government agency in the executive or legislative branches, or by a contractor or other organization on behalf of a federal agency in those branches.
NIST Special Publication 800-53 is an information security standard that provides a catalog of security and privacy controls for all U.S. federal information systems except those related to national security.
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.
Staff members at these call centres take calls from clients wishing to make reservations or other inquiries via a public number, usually a 1-800 number. These centres may operate as many as 24 hours per day, seven days a week, depending on the call volume the chain receives.
In the United States, a Social Security number (SSN) is a nine-digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205(c)(2) of the Social Security Act, codified as .