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my @output = sort { $a->[0] cmp $b->[0]
                 || $a->[3] <=> $b->[3] }
             map { chomp; [ split(',', $_, 4) ] }
             <INPUT_FILE>;

sub phone_value
{
     my ($v) = @_;
...
                 || phone_value($a->[3]) <=> phone_value($b->[3]) }
             map { chomp; [ split(',', $_, 4) ] }
             <INPUT_FILE>;