0~9 got 10digit , normal phone number is 10 then 11 digit , so 012-3456789 = 10 diigit , 012-3456788 = 9 digit , so how many digit is the most popular phone number , which is rare ?
from piers just bought number 012789=6digit , 012356=6digit , current number : 01267=5digit , 01469=5digit

1 of my number : 0158=4digit
other house member number : 01258=5digit , 012369=6digit , 014567=6digit . 014678=6digit , 0123467=7 digit , 0123458=7 digit

so most of phone number is 5 to 7 digit , other maybe can be nice number ?