# Open Data File and parse each line
	open my $DF, '<', $DFile or die "Can't open $DFile $!";
	foreach $_ (<$DF>){
		chomp( $_ );
		if((length $_ > 0)&&($_ =~ /^\d{15}/)){
			$_ =~ s/\s+/;/g;
			my($imsi,$mdn,$sec) = (quotewords('[\t;]+|,\s', 0, $_))[0,1,3];
			if((($imsi =~ /^\d{15}/)&&($imsi =~ /^(702|310)/))&&(($mdn =~ /^\d{10}/)&&($mdn =~ /^(501)/))){
				print $imsi.",".$mdn.",".$sec."\n";
				
			}
		}
	}
	close $DF;