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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.
10 digits are numbers in the billions.
there are 899 whole numbers that have three digits.
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
99999
California inmate ID numbers contain six digits.
10,000
Telephone numbers throughout Russia are uniformly 3 digits for the area code plus 7 digits for the local number.
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.
10 digits are numbers in the billions.
there are 899 whole numbers that have three digits.
UK home phone numbers have 9 or 10 digits after the 0 trunk code. The digit after the 0 is a 1 or a 2.
525
There is no seconds allowed on most phones as you can input the numbers as fast you want, although the phone may have a delay catching up to the sequence of numbers that you put in.
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
99999
two