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It is also possible for each subscriber to have a set of shorter numbers for the endpoints most often used. Most countries use fixed-length numbers (for normal lines at least) and therefore the number of endpoints determines the necessary length of the telephone number. Each such endpoint must have a unique number within the public switched telephone network. The number contains the information necessary to identify uniquely the intended endpoint for the telephone call. With landlines, modems and pagers falling out of use in favor of all-digital always-connected broadband Internet and mobile phones, telephone numbers are now often used by data-only cellular devices, such as some tablet computers, digital televisions, video game controllers, and mobile hotspots, on which it is not even possible to make or accept a call. In addition to telephones, they have been used to access other devices, such as computer modems, pagers, and fax machines. As telephone systems have grown and interconnected to encompass worldwide communication, telephone numbers have become longer. When telephone numbers were first used they were very short, from one to three digits, and were communicated orally to a switchboard operator when initiating a call.
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#Traktor 2 s phone number code
Telephone numbers are often dialed in conjunction with other signaling code sequences, such as vertical service codes, to invoke special telephone service features. Over the course of telephone history, telephone numbers had various lengths and formats, and even included most letters of the alphabet in leading positions when telephone exchange names were in common use until the 1960s. Telephone numbers were first used in 1879 in Lowell, Massachusetts, when they replaced the request for subscriber names by callers connecting to the switchboard operator. Telephone numbers are assigned within the framework of a national or regional telephone numbering plan to subscribers by telephone service operators, which may be commercial entities, state-controlled administrations, or other telecommunication industry associations. The exchange completes the call either to another locally connected subscriber or via the PSTN to the called party. 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. The prices are higher for more desirable numbers.Ī telephone number is a sequence of digits assigned to a fixed-line telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices for data transmission via the public switched telephone network (PSTN) or other public and private networks.Ī telephone number serves as an address for switching telephone calls using a system of destination code routing.