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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).
1 Businesses are able to transfer up to 25 numbers using a PAC Code. 2  Small businesses can use a PAC Code to transfer up to 25 phone numbers from one mobile network to another. 3  Larger businesses wanting to transfer more than 25 phone numbers should contact their network for full details on the process to follow.