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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. Toll-free directory assistance was provided by telecommunication ...
Several other prefixes, including 800-484, 800-703, 800-744, and 800-904 are reserved by the FCC. NPA-911 is forbidden as 9-1-1 is an emergency telephone number . (This is less restrictive than the rules prohibiting all three-digit N-1-1 codes as exchanges in all geographic area codes.)
In the Americas (defined as International Telecommunication Union (ITU) region 2), the FM broadcast band consists of 101 channels, each 200 kHz wide, in the frequency range from 87.8 to 108.0 MHz, with "center frequencies" running from 87.9 MHz to 107.9 MHz. For most purposes an FM station is associated with its center frequency.
Cellular frequencies. Cellular frequencies are the sets of frequency ranges within the ultra high frequency band that have been assigned for cellular-compatible mobile devices, such as mobile phones, to connect to cellular networks. [1] Most mobile networks worldwide use portions of the radio frequency spectrum, allocated to the mobile service ...
History. The technology of code-division multiple access channels has long been known. United States. In the US, one of the earliest descriptions of CDMA can be found in the summary report of Project Hartwell on "The Security of Overseas Transport", which was a summer research project carried out at the Massachusetts Institute of Technology from June to August 1950.
Charter Spectrum service logo. Charter Communications, Inc., is an American telecommunications and mass media company with services branded as Spectrum.With over 32 million customers in 41 states, it is the largest cable operator in the United States by subscribers, just ahead of Comcast, and the largest pay TV operator ahead of Comcast and AT&T.
License (G), where issued, is granted for Economic Areas (EAs). There are 51 MTAs, 493 BTAs and 175 EAs in the United States. A: 1850–1865 MHz and 1930–1945 MHz (30 MHz) B: 1870–1885 MHz and 1950–1965 MHz (30 MHz) C: 1895–1910 MHz and 1975–1990 MHz (30 MHz, 15 MHz or 10 MHz) D: 1865–1870 MHz and 1945–1950 MHz (10 MHz)
RespOrg. 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. RespOrgs were established in 1993 as part of a Federal Communications Commission order instituting toll ...