In the North American system with 3-digit area codes and 7-digit local numbers, there are slightly less than 8 million possible telephone numbers per area code, so with two area codes you have more than 15 million possible numbers. However, only a fraction of those numbers will be in use at any given time.
The two possible area codes for San Diego are 619 and 858.
Yes, any phone company can run out of phone number for a given area. When they do they create a new area code. (Houston has three.) When all the possible area codes are used up (There are a total of 680 usable area codes available for assignment in North America) they will have to change to an 11 digit system which will make every telephone device and the software for every database that contains phone numbers obsolete. If you thought Y2K was a potential problem you ain't seen nothing yet.
There are 900 possible three-digit numbers not beginning with 0. (Note, however, that this question does not accurately describe the restrictions on numbers that can be used as area codes.)
Tennessee area codes are 423, 615, 731, 865, 901, and 931.
One can use the WhitePages website to search for numbers with specific area codes. One can also use the 80Notes website to look for numbers that contain the 575 area code.
France does not have area codes - they have ten digit phone numbers that are dialled in full. Numbers starting '02' are normally in north west France.
One can find area codes at their local post office. The post office always has these on hand, and they will be happy to bring it out and show it to you.
There are no area codes starting 92595. All UK area codes start with a zero. Codes starting 09 are usually 'special' numbers - such as premium rate numbers.
There is no city in the UK starting with area code 791. All 'area' codes starting with 7 are mobile (cell) phone numbers.
That's not a legitimate number. There are currently no area codes starting with 06 in use. UK area codes start 01,02 or 03, free-phone and 'lo-call' numbers start with 05 or 08, mobiles start with 07 and premium rate numbers start with 09.
It's not possible. There cannot be two phone numbers, including the area code, that are exactly the same.
Jonesboro, GA, is in area code 770, with overlay codes 678 and 470. It is also possible that there may be a few 404 numbers in Jonesboro.