Here is some code to show what you could do, I have split it out into a lot of lines so it will be easier for you to read...

open (CELLNUM, "/usr/local/share/dailystats/.cellnum") or die "Cant op
+en Cell num file: $!\n";
open (CELLNUM2, ">/usr/local/share/dailystats/.cellnum") or die "Cant 
+open Cell num file: $!\n";
$cellnum = <CELLNUM>;
$cellnum++
print CELNUM2 "$cellnum";
close CELNUM;
close CELNUM2;
[download]

Then use $celnum in place of "3" in your orig script.. You will want to refine this approach but you get the idea.

-Waswas