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In the early 1980s, Bell Labs received a patent for what became AT&T's "Advanced 800 Service", a computer-controlled system where any toll-free number could point to any destination number, such as to a small business local number instead of a special InWATS line, and an itemized bill generated only for the calls the business actually received.
A toll-free telephone number or freephone number is one number that is billed for all arriving calls. For the calling party, a call to a toll-free number from a landline is free of charge. A toll-free number is identified by a dialing prefix similar to an area code. The specific service access varies by country.
600: Canadian non-geographic tariffed: teleprinter, caller-pays mobile, etc. October 1, 1993: rarely used, but serves some satellite phones in the Canadian high Arctic; Canadian TWX service used area code 610 until 1992, when it was exchanged for 600. 2015: 622 was activated for Canadian non-geographic use; 2023: 622 was overlaid with 633 for ...
Area code 600 has a capacity of 798 central office prefixes (200 to 999, with 555 and 911 not issued). Six relief area codes (622, 633, 644, 655, 677 and 688) are reserved by NANPA as subject to assignment in Canada for expansion of non-geographic services [ 5 ] but have never been used.
A rural telephone number, often party line, had often up to four digits and a letter or letter and digits to indicate which of the multiple parties on the line was desired. Various methods were used to convert these to dialable numbers as dial systems replaced manual switchboards; many moderately-large cities used a 2L-4N format where "ADelaide ...
N11-numbers provide access to special services. For example, This US road sign reminds drivers and passengers about 5-1-1 service.. 211: Community services and information; 311: Municipal government services, non-emergency number