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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).
The NANP can assign exactly 5,480,570,800 possible numbers in its 25 countries under current restrictions. Same rules as above, except: the 20 reserved codes are allowed, and the second digit 9 is allowed. Total: (10 * 10 * 10 * 10) = 10,000 possible subscriber numbers in each exchange, in each Area Code. Finally, there are 100 reserved numbers in each area code that can be used in fiction: (NXX) 555-01XX. There are 100 such numbers for EACH of the 692 area codes.