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A blue box device allowed for circumventing these charges by enabling an illicit user, referred to as a "phreaker," to place long-distance calls, without using the network's user facilities, that would be billed to another number or dismissed entirely by the telecom company's billing system as an incomplete call. A number of similar "color ...
Visiting card of Johann van Beethoven, brother of Ludwig van Beethoven. A visiting card, also called a calling card, was a small, decorative card that was carried by individuals to present themselves to others. It was a common practice in the 18th and 19th century, particularly among the upper classes, to leave a visiting card when calling on ...
Phreaking began in the 1960s when it was discovered that certain whistles could replicate the 2600 Hz pitch used in phone signalling systems in the United States. [3] Phone phreaks experimented with dialing around the telephone network to understand how the phone system worked, engaging in activities such as listening to the pattern of tones to figure out how calls were routed, reading obscure ...
A telephone card, calling card or phone card for short, is a credit card-size plastic or paper card used to pay for telephone services (often international or long-distance calling). It is not necessary to have the physical card except with a stored-value system; knowledge of the access telephone number to dial and the PIN is sufficient.
Toll-free calls are available both from mobile and landline phone operators. In Greece, the toll-free prefix is "800" followed by a seven-digit number or "807" followed by a four-digit number, used for phone card services only. In Hong Kong, toll-free numbers have the "800" prefix. [18] In Hungary, toll-free numbers have the "80" prefix.
In criminology, a calling card is a particular object sometimes left behind by a criminal at a scene of a crime, often as a way of taunting police or claiming responsibility. [1] The name is derived from the cards that people used to leave when they went to visit someone's house and the resident was absent. [ 2 ]
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In reality, the rechargeable calling card is a specialised form of a prepaid or debit account. To use the phone card, the user would call an access number (which is usually a toll-free telephone number), enter the "card number" (also called the PIN) and then dial the desired telephone number. The user could add value to the card at the same ...