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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.
The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits.
In 1993, the North American Numbering Plan designated area code 500 for personal communication services. An initial service concept was that customers could move a given seven-digit telephone number when relocating between numbering plan areas. The 500-code would thus be a non-geographic area code.
In Hungary, telephone numbers are in the format 06 + area code + subscriber number, where the area code is a single digit 1 for Budapest, the capital, followed by a seven digit subscriber number, and two digits followed by either seven (for cell phone numbers) or six digits (others). for other areas, cell phone numbers or non-geographic numbers ...
In Poland, numbers starting with 70, 30 and 40 are reserved for premium-rate services. 700, 701, 707 and 300 are "general" premium-rate services (usually charged per minute), 707 and 400 are assigned for tele-voting, mass-calls and so on (usually charged per call). Other numbers (702-706, 709, 301–309, 401-409) are reserved for future ...
This U.S. road sign alerts highway users to the availability of 9-1-1 service.. An N11 code (pronounced Enn-one-one) is a three-digit dialing code used in abbreviated dialing in the North American Numbering Plan (NANP).