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Code for updating verizon phone

Some ANACs are very regional or local in scope, while others are state-/province- or area-code-wide: there appears to be no consistent national system for them. Every telephone company, whether large or small, determines its own ANAC for each individual central office, which tends to perpetuate the current situation of a mess of overlapping and/or spotty areas of coverage.Under the North American Numbering Plan, almost all North American area codes reserve telephone numbers beginning with 958 and 959 for internal local and long distance testing (respectively), sometimes called plant testing.Automatic number announcement systems are based on automatic number identification, and meant for phone company technicians, the ANAC system works with unlisted numbers, numbers with caller ID blocking, and numbers with no outgoing calls allowed.Installers of multi-line business services where outgoing calls from all lines display the company's main number on call display can use ANAC to identify a specific line in the system, even if CID displays every line as "line one".

A technician calls the local telephone number of the automatic number announcement service.The phone can then be used to make and receive calls by anyone, making it a potential tool in anonymous criminal activity such as narcotics trafficking.Where a payphone does not have any number listed on the unit, the number can be discovered by calling an ANAC service.Formerly, some companies changed their ANAC number every month for secrecy; this is still the case with a few numbers.In one example of this concern, most payphones in the United States are assigned a telephone number and can ring if the number is called.The information is not reliable, as numbers change often. The list is presented by area code, number and location.In some regions, there are several numbers, depending on the telephone company or the area code of the caller, as there can be several central offices serving some areas.Late in the 20th century, caller ID and prepaid cellphone service became commonplace.These services being more easily exploited for criminal purposes, this type of abuse of payphones faded from concern.An automatic number announcement circuit (ANAC) is a component of a central office of a telephone company that provides a service to installation and service technicians to determine the telephone number of a line.The facility has a telephone number that may be called to listen to an automatic announcement that includes the caller's telephone number.

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