Area code then prefix.
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403
Assuming you can use the values listed, and the phone number is 7 digits (e.g. XXX-XXXX), then you can select 3 numbers for the first digit (0 is exempt) then 4 selections for the rest of the digits. So, 3*4*4*4*4*4*4 = 12288 phone numbers.
Phone numbers should always be stored in a text format and never as in a number field. There are several of reasons for this. You never do calculations with phone numbers; you may have a zero at the start of a phone number, which would disappear if left in a number format and you may, as in this case, have other characters in a phone number that are not digits, which would not be accepted in a number format.
You may be unfamiliar with this esoteric invention called a "phone book" which gives the numbers for people and businesses in your area, but I suggest you look into it (and then look IN it).
a fax number is just the same as a phone number so the same number of numbers