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Answer Wiki. There are between 700M-800M assigned geographic telephone numbers. Telecom service providers are the only entities that know how many active numbers they have. All service providers report this twice a year to the North American Numbering Plan Administrator (NANPA), a process called Numbering Resource Utilization Forecasting (NRUF).
Facing a shortage of telephone numbers -- ''number exhaustion'' to use the industry term -- regulators are adding area codes at a furious pace. Since 1995, 138 area codes have been added around the country, raising the national total to 344. Between 1984 and 1994, the nation made do by adding only nine.