10,000. from 0000 to 9999.
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9999
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.
a fax number is just the same as a phone number so the same number of numbers
birthday, social security, 911, phone number, address
I see this number everywhere. I see it in shops, phone numbers and i see it on the time... Weird and getting annoying